I've not done business with this outfit but they have a variety of automotive rubber and plastic seals and trim.
Plastic & Rubber Trim & Seals | Rubber Molding & Window Trim | Trim-Lok
Trim-Lok has a wide range of plastic or rubber seals and trims for use as a drip edge; window seal, trim or molding; rubber gasket or tubing; PVC trim; and more!
www.trimlok.com