1968 - 1969 Buick Gs 350 Convertible - U Jamb Door Lock Pillar Weatherstrip Seals. Quarter window U-Jamb seals mount to the rear side window, they are also refered to as door lock pillar seals. Ours are molded with a steel core just like the originals. Sold as a pair for the driver and passenger sides. Made from the original specs and from high quality ozone resistant materials to fit your vehicle.