Kurt, Steele Rubber Co. is the place to get the good stuff in rubber, but you'll think you're buying another truck! They ain't cheap! Everything I Have gotten from them, however acts like it came out of a factory package. Both of my panels, way different years from your 'burb, have (had) rubber all the around the right door and on three sides of the left one. It amazes me how consistent Chevrolet has been over the years on stuff like brakes, rubber and wiring, etc, so I'm GUESSING that all barn doors are pretty much the same.
Les