SORRY I DO NOT HAVE A PICTURE BUT LOOK GOOGLE SEARCH PETCOCK 23-1077 https://www.google.com/search?q=PETCOCK++23-1077&ie=&oe= I HAVE USED THESE ON MY 66 SPITFIRE, THEY WORK WELL, LOOK VERY CLOSE AND ARE LESS MONEY THAN MOST OF THE ONE THAT HAVE A SIMILAR APPEARENCE. YOU WILL NEED TO USE A BUSHING WERE THEY MATE TO THE TANK. FYI THE 66-68 SPITFIRE DID NOT USE PUSH PULL TYPE PETCOACK. THE PICTURE OF THE ONES YOU POSTED ARE CORRECT.
Dave, very nice bike find! I restored a 1966 Spitfire that was in a little worse shape than yours when I started. I tried using the fiberglass tank, just like yours, after sealing with the Caswell epoxy system. This worked for about a year. I have about 300-400 miles on the bike now. The tank started leaking at the seam between the top and the bottom pan. I ordered a Brooklands style alloy tank from Holtworks. (already mentioned in this thread by Andy Higham). Getting this new tank took over a year. I am in the process of painting it now. The bike has been sitting; I am anxious to ride the bike again. I also did a timing side bearing conversion, which seems to work well. Before I ride it again I want to install an oil filter kit. I am thinking one of the same type that is used on the Norton Commandos. +1 to Spitfire Ken, about the petcocks. Your picture shows the same ones that came with my 66. I am sure they are originals, and very cool looking. Unfortunately mine were broken beyond repair, so I opted to replace with the BAP ones. If you can repair yours to make them serviceable I would definitely do it. This forum is a wellspring of knowledge and good advice. Most any question will receive a smattering of ideas to solve it. I wish you luck with your Spitfire. Fullminator