Casey from SWISCO responded:
May 1, 2023
Hi Steve, We also carry the 58-134 that installs with a fat backing but the 58-135 is more common in our experience. I'll attach the dimensions of both options below. Also, keep in mind that the backing widths are different, which is an important factor for installation. If you're not sure if either of these would work, I would recommend removing a sample of your original seal from the window to confirm the exact dimensions and how it installs. Thank you! Profile view of 58-134
Profile view of 58-135
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