[Jack21]

Got mine from europaspares.com. It comes with a locking gas cap w/key inside the LeMans cap. Good for keeping fuel in the tank, and foreign material out. Also seals the tank. The cap to tank was done with primarily exhaust tubing, and connected with fuel tank line and hose clamps.

Tip. For added security, drill & tap an 8-32 thread at the cap-baseplate interface. Then install a setscrew so the cap cannot be turned or unscrewed unless you remove the setscrew. You can't even see the setscrew when it's installed.