I'm trying to figure out what year/ model my tractor is because I need to replace the fuel shut off valve. The tractor wasn't running due to old crumbling wiring. I got it running again but now it's leaking gas from the fuel shut off valve on the bottom of the tank. I want to make sure I order the correct part... It has 641 with 114580 (I'm not positive it's an 8, very worn there) under the 641 to the rear of the starter on the left side. The number on the engine on the right side is 310905, the number on the trans housing under the floorboard on the right side is 310835. It's starter button is next to the shifter. It's shift pattern is R 4 1 across the top, 2 3 on the bottom. Any help is greatly appreciated!