Existing roller is 2 1/8" wide, 1" high, 13/16" overall width include dimples, wheel outside diameter is 1 1/4". Although I do not find an exact match, your part #81-039 looks like it may be a good replacement. Please let me know if this will work, if you have a better match, if that part number will not work or if you needd more information.
Thank you
Paul from SWISCO responded:
May 24, 2012
Thanks for posting! Actually, have you seen our 81-077 sliding patio door roller? It appears to match your dimensions more closely. Would this be a better match? Let me know!
A quick learner from Door says:
May 24, 2012
Thanks Paul after more careful searching I did find and ordered two of the 81-077. I will let you know if it a fit. Looks right.
Thanks again!