Trying to finds In-ground basketball hoop part

You can check this guide to make an worthy purchase.

I am interested in basketball system. https://ballproguide.com/best-in-ground-basketball-hoop/

Will you be interested in a complete in ground basketball system?

I have a Reebok 51781 with a broken adjustment handle. It (and maybe your model) is built by www.lifetime.com. I just emailed them about replacement parts (none listed online). Perhaps you could do the same.

Well you can try to contact reebok directly, if not attempt to contact the store at which you bought the system. hopefully reebok will be able to send you a new piston...i believe that the hoop is under waranty