It was made by K4KEV from the Haynes forum. It's a bit taller than the standard book tank to give some extra range and should hold about 7.5 gallons if my calculations are correct.
The only downside was that it's a bit of a tight fit, and was a bugger to get in!
I had to trim my rear roll bar mounts down, then persuade the tank in with a rubber mallet.
A nice addition Kev made to the tank was to add a pot to the bottom of the tank where the fuel feed comes from to reduce the chance of running the pump dry under hard accelleration. It's also baffled inside to reduce fuel slosh.
Overall I'm pretty happy with it :)
