Dave Sr. from SWISCO responded:
March 30, 2016
It looks like you have an older style Bilt Best window operator. These are no longer available, but take a look at our 39-254E and 39-255E. These have a 7-1/2" arm. Match either of these up to your operator to see which one would work in your window. Due to how old yours is, they may require some adaptation to install. You will also need a new handle like our 39-114L, and new track like our 39-533.
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