This high quality reproduction, all-rubber seal fits inside the rear of the door, and holds the window steady in the rear "runner" inside the door as the window is raised and lowered. It also helps prevent the window from rattling when it is rolled down. Sold individually, 2 required per vehicle. *Note: This part was designed for the 70-75 Z Coupe. The original part for the 76-78 Coupe, and 74-78 2+2 (which is not currently available) was much shorter than this piece. For 76-78 Coupes and 74-78 2+2's, they (one for each side) will need to be cut to length.