You are looking at a brand NEW twist-in valve cover breather cap to suit:- Holden/Chevrolet OEM style bases - 6 & 8 cylinderTwist on section (ears) has: 35mm approx. OD - Circle section of 30mm OD - Ear width at circle approx. 12mm.Dimensions of the cap: 77mm wide x 40mm tallThanks 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.