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Thanks for writing in! Your casement operator resembles our 39-221B which is compatible with the 39-375 folding cover or the 39-451 non-folding cover. The opposite handed version is part 39-220B, compatible with the 39-376 folding cover or 39-452 non-folding cover.

Look over the dimensions and compare them to your existing operator to confirm that this is the right fit. 

detail of 39-221B