Casement operator differences

A quick learner from US says:
May 15, 2018

I ordered 39-028.  It does not seem to be an exact fit. Any help would be appreciated. The straight piece's end on the new part is round and my part is square. Also, the arm is about 2" shorter-which I knew about. The house is built in 1978. Hope that helps.

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Casey from SWISCO responded:
May 22, 2018

Hello,

I would suggest replacing the track on the sash with our 39-533 casement operator track. As for the arm length I don't think that will be a problem.
11-3/8" Casement Operator Track, 3 Hole
11-3/8" Casement Operator Track, 3 Hole
39-533
$2.95
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