The Saito FG 84-R3 and Saito FG 90R3 ring comes with special adapter nuts for mounting the ring to the engine and a pressure fitting for fuel tank pressure. Yes you can use fuel pressure off ring for gas applications.
Ring dimensions: Saito FG 84R3 and Saito FG 90R3 Diameter: 8-1/4
Inner Diameter: 6.8125
The length of supplied stand-offs is 3/8 inch, with these stand-offs installed onto your engine the ring is 3/8 inch beyond the supplied stand-offs when mounted to the engine. The ring cannot be made to move forward from this position because it will interfere with the spark plug caps and spark plugs.