Two sets of this are the wheels for a 1985? Sliding Door by Andersen Windows

I'm very confident we can get this roller for you, but the problem is that you're just showing me the internal portion of a complete roller assembly. It appears to be missing the external housing, which is probably still in the door.

Odds are what you have here is our 81-128. I would even bet on it, but you should check your outer housing just to be 100% sure. There are other possibilities so it's better to check now. You can see specs for the 81-128 below for comparison and confirmation.

Alternate image for 81-128