Halibrand produced this style cap and there was a few other companies that started producing the same style cap after them. It is in decent condition for its age with some oxidation on the aluminum and light rust on the latch mechanism. There is also a few imperfections on the cast lid as you can see in the photos. It should clean up pretty good.The base measures 7 3/8" OD across and the inside dimension of the inlet is 5". It is also your responsibility to be sure the item is what you want. The item "Vintage Halibrand Style Cast Aluminum Gas Cap Fuel Tank SCTA Gasser Race Car" is in sale since Sunday, January 26, 2020. This item is in the category "eBay Motors\Parts & Accessories\Vintage Car & Truck Parts\Air Intake & Fuel Delivery". The seller is "g-brown-775" and is located in Reno, Nevada. This item can be shipped worldwide.