1985 - 1987 GMC C3500 Epdm Molded Vent Glass Weatherstrip Seal Kit, Left and Right 2 Piece Set. This 1 piece design is molded from the exact original specifications to fit correctly. This 2 piece kit fits both driver and passenger doors. Be aware that there is a 1 and 2 piece design available for this year. Be sure to purchase the correct ones. You can review a comparison video here: http://youtu.be/9YwM0piQ-OE Our product is made from the original specs and from high quality ozone resistant materials to fit your vehicle.