I have been asked many times for information about where to purchase an Aston type gas filler cap. The US distributor is located in Sarasota, Fl. There are many sizes and styles available for purchase. Also, they are are sold in various finishes including polished aluminum, unfinished aluminum, and chrome plated. In order to attach the cap to the filler tube you must purchase and install a threaded collar into the gas filler opening. They are also available from this source. In my car the 2.5″ size for the cap and the collar was the proper fit. Their phone number is (941)355-0005. The actual company is call BAT, Inc.which is British American Transfer but the items are sold by MOCAL. The website address is:www.batinc.net/aston.htm.