Concave Roller for Sliding Windows

A distributor from Denver, CO says:
SRD Design has discontinued this roller and I am looking for a new vendor. The diameter is 3/4" The Width of the conclave rolling surface is 1/4". The BB housing is 3/8" Diameter. The axle protrudes 3/16". Please help.....
User submitted photo of their window hardware.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting, and for the detailed information. We may be able to help, but I need a couple more details. Please tell me the diameter of the axle, its total length (one side to the other), and how far it protrudes from the wheel. Thank you!
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