Bob from SWISCO responded:
November 10, 2021
Hi Steve. I agree, the 39-099 looks right. This is typically used to replace Andersen operators made from 1999 to the present. The 39-362 Adapter plate is typically used for older versions of the mechanism. If the hole spacing, or the distance between the center of each mounting hole matches what you have, then I don't believe it will be necessary. Dimensions for 39-099
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