Black Aluminum Oil Filler Cap (MMOFC-TOY-BK) by Mishimoto. Includes: Oil Filler Cap, Color Insert, 2 O-Rings. Material: 6061 Aluminum. Height: 1.14in. Diameter: 2.32in. Thread Pitch: M37 x 3.0. Add function and style to your engine bay with a Mishimoto CNC billet Oil Filler Cap. This item is a great compliment to any engine bay. The included O-Ring ensures a tight seal and the Mishimoto name on the top shows everyone who peeks under the hood that only the best in quality go on your car.