Fuel Valve Issue on CB500T

I've traced excessive gas fumes in our garage to a fuel valve petcock that's leaking. I'm having trouble finding a rebuild kit for it ('75 CB500T). I'd be willing to swap out the entire valve, but they appear to be hard to come by. I'm not keen on T-ing the two lines in order to adapt to a newer aftermarket valve. Any suggestions?

I think I found a stock replacement petcock up in New Hampshire...very hard to come by

http://www.ebay.com/itm/Honda-FUEL-PETCOCK-71-CB500-72-73-CB500K-74-CB550-69-CB750K-71-74-CB750K-CB-750-/390646275990?pt=Motorcycles_Parts_Accessories&hash=item5af4551f96&vxp=mtr

cxman said:

http://www.ebay.com/itm/Honda-FUEL-PETCOCK-71-CB500-72-73-CB500K-74-CB550-69-CB750K-71-74-CB750K-CB-750-/390646275990?pt=Motorcycles_Parts_Accessories&hash=item5af4551f96&vxp=mtr

Click to expand...

This won't work on the CB500T. The petcock on the '75 and '76 twin was unique to that model (part no. 16050-375-005).