Roller assembly

A quick learner from Baton Rouge,LA says:
March 7, 2021
Existing rollers stamped PRODUCTION Enterprises Inc Hialeah FLA is single roller. Want to replace with tandem roller assembly if possible. When I look at your roller diagrams, I can't tell if the roller diameter quoted is a edge of roller or bottom of grove.
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Bob from SWISCO responded:
March 9, 2021

Thanks for your photos. Start by comparing to our 81-023 and 81-277. I think one of these might be what you need, but please confirm your dimensions to see which matches best. 
Sliding Door Roller, 1-1/4"dia. Steel Concave BB
Sliding Door Roller, 1-1/4"dia. Steel Concave BB
81-023
$10.20
Patio Glass Door Roller, 1-1/2" Dia.
Patio Glass Door Roller, 1-1/2" Dia.
81-277
$9.87
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