Someone correct me if I am wrong but... Pete Serio, the window guy, once told me that GM weatherstripping is the best. Why? Because the 90 degree bends and stress points in the OEM stuff has a plastic piece molded into them for strength. No other manufacturer makes them that way that I know of. When I called Softseal on this, the guy laughed and said if they had the money for those types of machines that can mold over plastic, they would get them.