Brown Whitco window winders. Stamp on back plate FG 6096

A contractor from Tucson, Arizona 85715 says:
October 4, 2021
I have wood windows with Whitco winders. The winder gears are stripped in several of the winder units. Units are riveted so I'm assuming the gears can't be replaced and the whole unit must be replaced. The house was built in 1989. Are these winders still available? If not are there like replacements?
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Emily from SWISCO responded:
October 8, 2021

Hey there!

We don't carry this exact skylight operator, but take a look at our 39-379 and see if you can use this as substitute. 
Skylight Operator, Angle Drive
Skylight Operator, Angle Drive
39-379
$81.30
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