1959 Cadillac Rubber Tail Light Gaskets. These Will Not Fit The Standard Tail Lights! How about this brand new pair of tail light gaskets for your favorite Cadi? These fit the custom flush mount Cadillac tail lights. They are 3 13/16" od and the screw holes are 3 1/4" on center. This listing is for 2 molded rubber gaskets as shown.