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I think they help the top stow properly when folded and help the plastic coated wire bead to seat into the hard plastic folding frame over the top of the door window when the top goes up. They seem to come off a lot of Boxsters. Both of mine came off a few years ago and I sewed them back in by hand, what a pain in the @$$ to push the needle through the canvas and the plastic edge of that beading. A lot of folks leave them off after they come off without any ill consequences.
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