DYAD left hand casement window operator

A handy person from South Windsor CT says:
Arm marked 30866 and has 4.500: hole spacing, with 5.00" OAL. Base unit has 5" mounting hole spacing. Looks like the 39-188?
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Bob from SWISCO responded:

Thanks for posting. I agree, the 39-188 looks promising; just make sure that the length of the link arm matches up. Let me know if it differs at all.

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