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Got mine from LMC there are 2 different seals, one for factory window and one for aftermkt such as C.R. Laurence (sp). Dennis Carpenter also has seals, I have used them as well, great products.
I have a CR Lawrence slider. The best deal I could find was on Ebay. It uses the non slider seal. In my opinion these are at least as good if not better than the OEM slider.