window operators

A quick learner from chicago says:
Product Code: 39-280 looks like it would work for my windows except the arm with the 2&1/2" measurement needs to be 1&7/8, all the others match up,any help? Thanks
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Tom from SWISCO responded:

I'm afraid we haven't been able to find a replacement for the 39-280 with an arm that small. The 39-280 may still work, though; the linkage in these windows tend to be very forgiving. You may have enough play to get it to work.

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