Vinyl casement operator

A handy person from Wildwood, NJ says:
I'm looking for 2 left and 2 right with all parts to be replaced. On the bottom of the main 8" crank arm it has the number 3108 but no logo or anything else on window or assembly.
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Jasmine from SWISCO responded:

Thanks for reaching out! Your casement window operator looks a lot like our 39-329 LH Inverted Split Arm ROTO Operator. The opposite handed version is our 39-330. The operator you have pictured appears to be connected to the window using the 39-553 Roto Sash Bracket. The 39-330 would likely use the 39-554.

You may also need the 39-232 Roto Folding Crank Handle.

To confirm that these operators are the right fit, carefully review and compare the dimensions below.

Alternate image for 39-329
Alternate image for 39-329

Side profile view with measurements
Side profile view with measurements

Anatomy of a casement window
Anatomy of a casement window
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