----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----Hi Norm; I think those panels would be considered like upholstery, and therefore would probably not need a 337 if you replaced them. However, you must be sure to get the curvature the same as the originals. They seem to work best if you put 3 strips of felt, about 3/4 inch wide and running most of the way up and down the panel, and spaced evenly apart. This gives the window something soft to rub against if there is some pressure from the inside that causes the panel to touch the window.
Lynn Nelsen
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