This is what I have on my car and it works very well...
http://www.eastwoodco.com/shopping/product/detailmain.jsp?itemID=21507&itemType=PRODUCT&iMainCat=631&iSubCat=631&iProductID=21507
I put a length on the top of the windshield frame after cleaning the frame with alcohol and it lasts quite a while. Its thin enough that, on my car anyway, the latches still work although it takes a bit more effort to compress the weatherstripping. Just enough to make a good seal.
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