Sold as a pair, two pairs required per car. These go in the channel in the quarter or fender extensions and space the extension from the panel the correct distance. These are manufactured using the size of the 1969-73 rubber seals, the 1967-68 seals were originally slightly thicker at the portion where the two body panels meet. These are straight runs of rubber, not contoured or molded like found on your fender and quarter extensions. *NOTE* Do not over tighten the studs that mount the extensions. They are made from a soft metal and will dimple easily in the area where the studs meat the extension. “Snug” the nuts gently.