I am in desperate need of a frame pet chicken for my GS 500F. Its not the one on the tank but the actual on that sits on the frame itself. The one that switches from reserve,prime and on.  Mine is leaking like a Buddha Loves You and I can't seem to find any online except the retarded over priced OEM ones.

Assuming yours is a '01+ model, here is one on ebay for cheaper than OEM:

http://www.ebay.com/itm/SUZUKI-GS-500-GS500F-GS500-500F-FUEL-PETCOCK-VALVE-GAS-TANK-4800-MILES-09-S16-/121472342621?pt=Motorcycles_Parts_Accessories&hash=item1c4850da5d&vxp=mtr

Yes! Mine is a 04 model thanks so much for this!!!

No problem, cheers!

I assume you already bought this, but if not, I have one in perfect condition ill sell for $15 shipped.