Rechromed, used oil fill cap for 1967 Mercury Cougar or Ford Mustang with 289 or 390 and California emissions. This chromed push on oil cap was used on the DGS package or 390 GT engine dress up kit which included chrome valve covers and air cleaner lid. Identified by the vertical pointing elbow, for attaching a hose to the air cleaner base. Marked FoMoCo on the top inside a rectangle box.
*Note - a Black painted version was also available on most 289 engines sold in California.