Iron Cross Automotive
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Use this seal when the topper window is larger than the truck cab rear window. The topper window needs to be removed and the thickness of the fiberglass flange should be 1/8-3/16 inch thick. The gap between the topper and the cab should be at least 3/4 inch less than the width of the boot. Example a 4 inch width boot should be used when the gap between cap and topper is 3 - 3-1/4 inch. A 3 inch boot when the gap is 2 - 2-1/4 in.
The boot attaches to the topper by pressing the clip end into the channel left exposed when the window and weather-stripping are removed.