How to know what Andersen Tandem Roller I have

A quick learner says:
My Anderson sliding door was installed back in the mid to late 1980's. Door works fine bine getting hard to roll back and forth. How would I know what model roller to buy? Can't find model number for this door. Does one size fit all?-Thanks!
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Tom from SWISCO responded:
I'm afraid not. There could be a few different possibilities. The only way to know for sure is to remove your current roller and compare it to the hardware we show online. I see you were looking at our 81-128, which is one possibility, but you should also see our 81-018. If neither match, then you can take a few pictures of your hardware for us to see and we can try to find something better.
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