Tandem roller for Keller sliding glass door

A home owner from Birmingham Al says:
Body is 3/4 wide 3 1/8 long 1 3/32 high does not have mounting screw. Wheels are 1 1/4 dia.
User submitted a photo of a patio door roller.
Profile picture of Paul
Paul from SWISCO responded:
This looks very similar to our 81-154. Check it out and let me know if you agree.
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