correct roller identification

A landlord from Salem MA says:
I'd like to be order the correct replacement rollers prior to removing the door. This would save the trouble of removing and reinstalling the door twice. The doors are 4' wide. The Anderson logo appears in the top corner of the glass with the following info engraved below: "IGCC 186" and "WHBI 7-86". I'm guessing the 7-86 was the month & year of manufacture. Can the other info help identify the proper rollers?
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Paul from SWISCO responded:
I agree. Based on those stamps, I think your door was made in 1986. With that in mind you could have our 81-128. That said, I cannot guarantee it's a match.
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