Dave Sr. from SWISCO responded:
February 9, 2024
Thanks for reaching out to us. I don't believe the 39-389 is what you want. This is specifically designed for Andersen brand windows, which isn't what you have here. It also mounts differently; for ours, the screws go straight down into the sill whereas on yours they go horizontally into the trim. Consider instead our 39-312. Look over our dimensions to see how well they compare. My only major concern here, other than size, is that the shoes at the end of the arms will be different than what you have now. If they are then you may also need to replace the track with our 39-512. Just something to keep in mind. Dimensions for 39-312
Alternate view of 39-312
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