Dave Sr. from SWISCO responded:
November 7, 2017
Yes, the only other size would be the 39-037, with a 13-1/8" arm span. I believe it should work in your window. It might not open up as far as your original, but it won't interfere with the overall function, ideally. I think the size you originally had is no longer available. I did check with suppliers, and I could not come up with anything that uses a 18-1/2" arm.
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