Suzuki offers (or did) a tank bra for the 2G. I think LP-USA has one, too. I know Banditmania carries one.
Push comes to shove, you can use a 1G tank bra on a 2G tank. It's not a perfect fit, but then the one Suzuki offers for the 2G doesn't fit perfectly either, the flaws are just in different places.
(The one that's for the 2G fits a little loose and the 1G bra on a 2G tank fits tight, but the seams don't match the tank lines as well.)
I have a 1G tank bra on my 2G.