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I'm selling a 24L dual fill endurance fuel tank to fit the 07-08 R1. This was purchased from Phase One Endurance in the UK. It is designed to be used with a superbike tail section (one piece race tail) and a race subframe. You could likely fit it to a standard subframe with the correct bracket (I can send a picture of what the bracket looks like for those interested).
It takes a standard 4C8 fuel pump and uses an external vent boss on top of the tank. It is completely hand made/welded from aluminum.
You could either fit a set of dry breaks from a company like ATL, or block one side off with a round plate and fit a collar to the second to run whatever cap you like. Newton Equipment makes applications for this.
$400 shipped.