Left rear toe adjuster seized

Indeed the rear isn't adjustable by itsself. There are however ways to adjust, either using shims or by pressing the rear axle.

Renault apparently only concern themselves with total toe-in (I've seen the documents), meaning that if total toe-in on the rear axle is within specs, even if one wheel points straight and the other has toe-in, you 're out of luck as far as warranty is concerned. Its 'normal'.

Thankfully the car does not pull, it goes completely straight on a straight road. I'm just worried about tyre wear and, well, I'm kind of a nutter about wanting everything on the car's geo to be perfect (which thankfully is, except rear toe-in).

I saw a post in here with a Renaultsport parts list that included rear toe & camber shims. However the part number doesn't come up when searching Renault's part database. Anyone know how to get them?

Toe adjustment is made with the adjusting sleeve #8 located on both sides.

replace anything that was bent and then have the rear end alignment done at a wheel alignment specialist shop
any specialist shop when doing a front alignment should always check the rear first as it controls the accuracy of the front job

On these LH body cars, camber is not adjustable. Neither is caster. Those angles are preset by the suspension geometry. However, specifications for them ARE published. Generally, if either of those two parameters are out of spec, then it's likely something is worn or damaged and needs to be replaced.

The only adjustable parameters are to the front and rear toe but specified as "Total Toe" - see note below.
The alignment specs are as follows ...

ALIGNMENT SPECIFICATIONS AT VEHICLE CURB HEIGHT
A. FRONT WHEELS

1. CAMBER
   Acceptable -0.6° to +0.6°
   Preferred +0.0°
   Side to Side Differential
   Acceptable 0.7° or less
   Preferred 0.0°
2. TOTAL TOE - Specified in degrees. See Note Below
   Acceptable 0.4° in -to- 0.0° out
   Preferred 0.2° in
3. CASTER* (reference angle)
   Acceptable +2.0° -to- +4.0°
   Preferred +3.0°
   *Side to Side Caster Difference not to exceed
   Acceptable 1.0° or less
   Preferred 0.0°

B. REAR WHEELS

1. CAMBER
   Acceptable -0.6° -to- +0.4°
   Preferred +0.1°
2. TOTAL TOE** - Specified in degrees. See Note Below.
   Acceptable 0.2° out -to- 0.4° in
   Preferred -0.1° in
   **TOE OUT when backed onto alignment rack is TOE IN when driving.
3. THRUST ANGLE
   Acceptable -0.15° -to- +0.15°

Note: "Total Toe" is the arithmetic sum of the left and right Toe settings. Positive is Toe-in. Negative is Toe-out. Total Toe must be equally split between left and right wheels. Left and Right Toe must be equal to within 0.02° (2 one hundredths of a degree).

Courtesy RJK & Concorde Shop Manual

If the car is stock then I would run the caster at .05 higher on the right than the left to adjust for the crown of the road. the front alignment looks good other than I am not sure which one is camber and which one is caster. To adjust the rear camber on these cars you have to have a camber kit. From the angle I am seeing you don't have a camber kit. Also the only way to adjust caster on the civic is to shift the sub frame.

An Alignment shop can adjust it,

There is a rear suspension offset toe link
bolt avail for around $ 12.00 ea

Google--- 2005 buick lacrosse rear toe out adjustment

Are you sure it's the 'camber' needs adjusting? Camber is the measured distance between the two front wheels at the top AND the bottom, measured ACROSS the car.
The most common adjustment used is 'Toe'. It's the same method of measurement as camber BUT is at the Front and Rear edges of the front wheels. (Think of your own feet. toes in, / \. Toes out, \ /).
That hit you mentioned to the left side of the car might also have bent something else, like suspension or chassis.
Get a GOOD wheel alignment specialist to look at it.

Before making wheel alignment adjustment, perform the following checks:

1. Tires should be equal in size and runout must not be excessive. Tires and wheels should be in balance, and inflated to manufacturer's specifications.


2. Wheel bearings must be properly adjusted. Steering linkage and suspension must not have excessive looseness. Check for wear in tie rod ends and ball joints.
3. Steering gear box must not have excessive play. Check and adjust to manufacturer's specifications.
4. Vehicle must be at curb height with full fuel load and spare tire in vehicle. No extra load should be on vehicle.
5. Vehicle must be level with floor and with suspension settled. Jounce front and rear of vehicle several times and allow it to settle to normal curb height.
6. If steering wheel is not centered with front wheels in straight-ahead position, correct by shortening one tie rod adjusting sleeve and lengthening opposite sleeve equal amounts.
7. Ensure wheel lug nuts are tightened to torque specifications

Ride Height Adjustment

Before adjusting alignment, check riding height. Riding height must be checked with vehicle on level floor and tires properly inflated. Passenger and luggage compartments must be unloaded. Bounce vehicle several times, and allow suspension to settle. Visually inspect vehicle from front to rear and from side to side for signs of abnormal height.
Measure riding height. See figure. Riding height between left and right sides of vehicle should vary less than 1′ (25.4 mm). If riding height is not within specification, check suspension components and repair or replace them as necessary.
Wheel Alignment Procedures

Honda recommends using commercially available computerized 4-wheel alignment equipment. Follow equipment manufacturer instructions to obtain vehicle alignment settings. Use following procedures for necessary adjustments.
Civic Camber Adjustment
Compare camber settings with vehicle manufacturer recommendations. If camber is incorrect, check for bent or damaged front suspension components. Replace faulty components. Recheck camber.
Civic Caster Adjustment
DO NOT use more than 2 shims. If more than 2 shims are required to adjust caster angle, check for bent or damaged suspension components.
Compare caster settings with vehicle manufacturer recommendations. If caster is incorrect, check for bent or damaged front suspension components. Replace faulty components. Recheck caster.
Civic Toe-In Adjustment

1. Secure steering wheel in straight-ahead position. Measure front wheel toe-in. If adjustment is needed, loosen tie rod lock nuts. Turn both tie rods equally in the same direction until front wheels are in straight-ahead position and toe-in reading is correct. Tighten tie rod lock nuts. Reposition tie rod boots if twisted.
2. Ensure parking brake is released. Check rear wheel toe-in. If adjustment is needed, hold adjusting bolt on rear compensator arm and loosen lock nut. See figure. Adjust rear toe-in by sliding rear control arm until rear toe-in is correct. Install NEW lock nut, and tighten it while holding adjusting bolt.

Wheel Alignment Specifications

• Camber - Measurement in degrees.
  • Front: 0 (range -1 to 1)
  • Rear: 0.33 (range -1.33 to 0.67)
• Caster - Measurement in degrees.
  • 1.17 (range 0.17 to 2.17)
• Toe-In - Measurement in inches (mm).
  • Front: -0 (0)
  • Rear: 0.08 (2.0)
• Toe-In - Measurement in degrees.
  • Front: 0.00 (range - 0.16 to 0.16)
• Toe-Out On Turns - Measurement in degrees.
  • Inner: 41.00
  • Outer: 33.50

Torque Specifications Ft. Lbs (N.m)

• Rear Control Arm Adjusting Bolt: 48 (65)
• Spindle Nut: 136 (185)
• Tie Rod Lock Nut: 41 (55)
• Wheel Lug Nuts: 80 (108)

hope this helps you out.

Alignment: Specifications
Alignment
Wheel Alignment
Tire size:
VAN, LX, EX, EX-L models: P235/65R16 103T
EX-L Touring model: P235-710R460A 104T
Tire pressure:
Front (VAN, LX, EX, EX-L Touring models) ........................................................................................................... 230 kPa (2.3 kgf/cm2, 33 psi)
Front (EX-L model) .................................................................................................................................................. 240 kPa (2.4 kgf/cm2, 35 psi)
Rear ........................................................................................................................................................................... 240 kPa (2.4 kgf/cm2, 35 psi)
Caster angle ................................................................................................................................................................................................... 2° 32' ± 1°
Camber angle:
Front ........................................................................................................................................................................................................ 0° 00' ± 30'
(Maximum difference between the front right and left side: 0° 30')
Rear ............................................................................................................................................................................................................. -0° 30' ± 45'
The camber angle can be adjusted up to ±25' (center of tolerance) by replacing one damper pinch bolt with the adjusting bolt. The camber angle can
be adjusted up to 50' by replacing both damper pinch bolts with the adjusting bolts.
Front toe-in ............................................................................................................................................................................. 0 ± 2 mm (0 ± 1/16 inch)
Rear toe-in ......................................................................................................................................................................... 2 ± 2 mm (1/16 ± 1/16 inch)
Turning angle

Inward wheel 41° 56' ±2°
Outward wheel 34° 32' (Reference)

Toe - 0° +/- 2mm

REAR WHEEL ALIGNMENT
TOE-IN : 0±2 mm (0±0.08 in.)
1. The rear suspension lower arm mounting cam bolt should be turned an equal amount on both sides during adjustment. Right wheel : Clockwise direction : toe-in Left wheel : Clockwise direction : ton-out Maximum difference between LH and RH : 3mm 2. The cam bolt should be adjusted within a 90° range left or right from the center position. CAMBER Standard value : 0°±30´ Maximum difference between LH and RH : 3mm : 0±2 mm (0±0.08 in.) 1. The rear suspension upper arm mounting cam bolt should be turned an equal amount on both sides during adjustment. 2. Install the left and right springs which have the same identification color. 3. The cam bolt should be adjusted within a 90° range left and right from the center position. TIRE WEAR 1. Measure the tread depth of the tires. Tread depth of tire [Limit] : 1.6 mm (0.06 in.) 2. If the remaining tread depth is less than the limit, replace the tire. When the tread depth of the tire is reduced to 1.6 mm (0.06 in.) or less, the wear indicators will appear.