Sliding window roller replacement ID help

A quick learner from Miromar Lakes, Fl says:
March 20, 2011
Need replacement parts. Don't know window manufacturer.

1-1/4" long

1/2" body width

11/16" closed end width
user uploaded photos of roller
Profile picture of Paul
Paul from SWISCO responded:
March 22, 2011
Thank you for submitting your images.

The Swisco 87-111 Sliding Window Roller appears to be a good replacement.
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