Patio door roler assembly

A home owner from Texas says:
I need help ordering this. I have 7 doors I need to fix. Will also need 8 foot track covers for all 7
User submitted photo of their door roller.
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Tom from SWISCO responded:
Thanks for posting. It's hard to make out your dimensions with just a tape measurer, but see our 81-278 and 81-279. I think you may need one of these. For track covers, we have two types: the 80-100 and 80-103.
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