The translucent plastic Door Panel Vapor Barriers protect your 1987-93 Mustang's door panels and cabin from moisture that can make it's way in through the inner door cavity. Although they were factory equipment on all Mustangs very few still remain in tact. Plus, you can enjoy a cooler quieter ride & block out damaging moisture with our Mustang door panel sound deadener set. Install between your Mustang's door panel and door for an instant improvement in noise reduction and for better stereo sound.