No need to go Yamaha. Quadracer 250 and Quadsport 230 petcocks fit perfectly, as well as almost all other older Suzuki non-vacuum petcocks. However, between the Quadsport and Quadracer, one exits to the front and one exits to the rear, and I can't think of which is which right now. We put whichever one points to the front on our LT80. Works perfect!
As a warning, don't use a Zilla petcock. It's much bigger than the others, and you would not want to deal with clamping that big of fuel hose on the little LT80 carb.