I HAVE A SOLIGOR 2X CONVERTER AND I NEED A NIKON ADAPTER IS SUCH A THING AVALIBLE

Melissa. The 2X-1 is for use on a M42 screw connection, like on Pentax The 2X-3 is for Nikon.

have you tried cleaning the lens contacts with soft cloth?

ifnot do that.

is there no problem with out the lens in there?

As you can read in the Dpreview link the Tamron converter can work perfectly with the Canon cameras. Question is, will AF still work, because you have to multiply the aperture twice. So if your lens has f/1:5,6 that will become f/1:8. Most camera's can't auto focus anymore on F 8

link to Dpreview Tamron 2X converter

The Soligor C / D 7 is a tele convertor. If you want to use it on a Nikon, I hope you have the correct connection. Your question implies you are planning to using this with a mirror lens. Most miss or lenses, come with f/1:8 and the convertor will make that to f/1:11. Most cameras only can auto focus till f/1:5,6, so when using this, forget auto focus, because that won't work.

The rear element of the lens is near the mount the converter
will not fit the conveter needs about 10mm space at the
back of the lens

This is a lens for Sony/Minolta cameras. It is not compatible with the Nikon D90. Hence a Teleconverter for Nikon will not work on this lens to mount it to a Nikon D90.

aturnbull1,
any good camera store or repair shop should have a 2X tele converter for MZ-60, new or used. i would try e-bay also.

You need to track down a 2x teleconverter that has a Pentax A mount for it to work correctly on the moun t of your camera.

I believe Adorama has one here:
http://www.adorama.com/PRO2XPX.html

Check with them first to ensure compatibility

A 2x tele-extender will rob you of two stops of light. This is simply a matter of physics: you're looking at only one quarter of the scene, so you'll only get one quarter of the light.

You specified neither the camera body you're using nor the lens you're using the tele-extender with. Most Nikon bodies will not autofocus with lenses slower than F/5.6. (Actually, they might, but F/5.6 is what Nikon specifies.) With the two-step penalty, a lens would have to be F/2.8 or faster in order to autofocus.

The solution is to either get a faster lens ($2000 or so) or to switch off the autofocus and go manual.

You can purchase an off-camera flash sync adaptor at any good camera store, complete with extension cable.   The should work fine.