Looking to see if anyone knows where to get replacement fixtures for these

looking for replacement fixtures for these

 

it they are not broken clean them up and spray them with UV safe automotive clear.

 

Those sockets had a tendency to go bad- If you are chasing a faulty light (inoperative) I would bet its the socket.... If so someone here had done research on the socket by itself (part number) its the same as one of the fronts if I remember right.....
So if its just a light out (say, like just the brake light) its the socket.... under a $20 fix for the new GM socket.

 

It could also be the chassis plug that connects to the GM socket as well: https://www.ebay.com/itm/2005-to-200...sAAOSw7o5Z4gg-

 

I have a brake light out on mine, I need to check it out when the weather warms up.