Bottom roller for mirrored sliding glass door

A home owner from Pembroke Pines, FL says:
There is a Patent Pending number which I can only see the beginning and ending numbers of: DS???21

The part has the follow dimensions:
metal frame height: 3 9/16"
met frame width: approx 1 3/4"

wheel: approx 1 5/8"

height of entire unit (plastic and metal frame): approx 5"

Thanks for your help!

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Tom from SWISCO responded:

I'm not sure I recognize this roller, but the design is very similar to our 23-225 . Look this part over to start out and see how well it compares to your original.

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