Pillar Post Weatherstrip Note
The new pillar post weatherstrip is molded from the original and is designed to be a direct replacement. Years of pressure from the window glass on your existing weatherstrip has caused a "channel" to form into the weatherstrip. While this would appear to be intentional from the factory, it is actually formed over time from the pressure of the window glass. This channel is not present on the new weatherstrip. Glass adjustment will most likely be required because of this.
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Ford Mustang - 1987 (87) - 1988 (88)