My research indicates petcocks from any Suzuki GS550LT (80), GS750ET/LT (80), GS850GLT (80), GS1000ET/GLT/ST (80) or GS1100ET/LT (80) are the same 50mm spacing and OEM fitment. Now I'm just trying to figure out which of those are non-vacuum type.. If anyone knows for sure, please speak up. Thanks!