Gulf Stream RV Shower door Upper Roller.

A handy person from Indiana says:
Any thoughts or ideas on replacement parts for these?

Looking down into a recessed area behind the rollers swivel-arm attaching screw, there is either a "4" or a "2" imprinted on the part. that's the only identifying numbers I have found.
Thumbnail of the uploaded file named Shower Upper Roller 1.jpg
Thumbnail of the uploaded file named Shower Upper Roller 3.jpg
Thumbnail of the uploaded file named Shower Upper Roller 4.jpg
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Paul from SWISCO responded:

This looks similar to our 10-071 housing, but with one convex wheel. We will need the diameter of the wheel. From there we should be able to narrow this down. 

10-071 : Shower Door Roller Assembly, Round Door
Shower Door Roller Assembly, Round Door
10-071
$13.14
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Installation Instructions for the 10-071 Shower Door Roller Assembly
Installation Instructions for the 10-071 Shower Door Roller Assembly
GUIDE
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