eBay mate there's a few on there, is the tank knackered or just rusty?! I had to replace mine although not used it yet as the fuel return broke off and it was pretty bad anyway.

Remember an old post saying the swirl pots inside are better on genuine ones than the pattern ones but they are all you can get now, unless you can find a good second hand one!!
But if yours is solid and just rusty you can just get it blasted and powdercoated