Dave Sr. from SWISCO responded:
March 29, 2017
You have the old Bilt Best operator setup, which is unfortunately, discontinued and no longer available. You will need to use one of the newer type of operators like the 39-027E and 39-028E or maybe the longer 39-013 and 39-014, depending on the size of the arm. You will also need to install the 39-533 track on your window sashes. You might need to use the services of the carpenter or wood shop to make new wood sill covers, since these operators aren't exact.
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