Dave Sr. from SWISCO responded:
March 21, 2016
Thanks for posting. Bilt best is no longer in business, I'm afraid, and we suggest using one of the newer style operators. The bad news is, you will likely have to make a new wood sill cover, in addition to other adaptations depending on what hardware you choose to go with. I don't know exactly what can work for your window, but look at the list I made on the right side of this page. This will at least get you started.
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