You are looking at a brand NEW chrome flat oil cap!- Holden/Chevrolet - Twist Type - OEM style base to suit most 6 & 8 cylinder engines.The twist on section (ears) has: 37mm OD approximately, 30mm OD circle section and 12mm ear width at circle approximately.Thanks for looking and don't forget to check out all of our Restoration Essentials in our store. Your parcel will have a unique tracking number which will be sent to you via email on dispatch so you can keep an eye on your delivery.