Patio door roller

I'm afraid that I don't recognize this roller off the bat. It looks like just part of a larger assembly, much of which is missing. I'm a little reminded of our 81-002 and 82-003, but these are just educated guesses. Look these parts over and see if they match what you have now. If not, or if you aren't sure, then we will need to see a picture of the complete roller assembly.