Help needed to identify window operator

A contractor from San Francisco says:
December 21, 2022
Hi there, I'm trying the find this replacement part, in particular the wheel part is broken.
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Tom from SWISCO responded:
December 22, 2022

Hello! My recommendation would be the 39-253LB. This appears to match your original design pretty closely, but look it over and see what you think.

Dimensions for 39-253LB
Dimensions for 39-253LB
Encore Dual Arm Operator, Sill Mount
Encore Dual Arm Operator, Sill Mount
39-253LB
$30.70
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How to Orient a Dual-Arm Operator
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Comparing the 39-253LB & 39-438B Operators
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