I don't remember off hand, and I can't quits see inside far enough. But I know when faced with the problen of having fuel tank butting the firewall I have usually made the copper tubes coming out of tank a bit longer, and simply inserted the silicone are targon fuel tubing over extended copper tubing into firewall. Feul tubing is fastened at tank and tank is support with light foam inside tank compartment, and braced at rear tank to avoid any movement.