Fleetwood sliding door rollers

A distributor from Honolulu, HI says:
We ordered 81-168 Tandem Roller Assembly, SS Wheels, but they are too wide. We need them to fit large Fleetwood sliding doors manufactured in 1983. The channel width is about 5/8". Do you have such units?
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Dave Sr. from SWISCO responded:
Thanks for posting! I'm not sure if Fleetwood ever used our 81-168 , but they have used our 81-056 on some of their doors. Could that be what you have? Carefully compare its dimensions to your part to be sure. If not, take a couple pictures of it for us to see and tell me exactly how the dimensions differ. That will help us find a better match!
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