This is a brand new Vented chrome custom gas tank cap. This is the cap used on most bobber / chopper tanks on Triumph motorcycles, also replaces Harley number 61103-36

The cap ID is 2 1/2" the center OD is 1 1/2", the tabs are 7/16"

We have the gas tanks to fit these caps in our ebay store. If you need anything else check out our ebay store. If you have any questions please feel free to ask. We combine shipping costs on multiple wins and we accept most major credit cards. Enjoy