Bob from SWISCO responded:
September 16, 2020
As long as the lower dimensions are the same, I don't think the extra-width on the top surface should matter too much, since this just sits atop the surface of the window frame. If the other dimensions listed match the 26-393, I think this is a better match--the 26-393B is essentially the same, but with different locking tabs on the side (those circular shapes in the photos). |