Harcar 3X5 horizontal sliding window 50/50

I'm afraid I don't recognize either the corner or the roller. I will need detailed dimensions of each. For the corner especially, I need to know the width and thickness of the legs.

I'm glad you were able to fabricate the corner, that was a tough one. The roller is a little hard, too, though. These kind of parts are hard to get a hold of these days. The closest match in our inventory is the 87-016, which has a 1/2" nylon wheel. Would you be able to adapt this to work?