The mounting system of course will fit on a General but the bed on the General sticks out to the sides more than a Ranger so you will need to mount it with the fuel on the inside. With that in mind, if the bar on your chainsaw is too long it will hit your fender/bed on the outside.
Another way to accomplish what you want to do. You can get a R-3015 Th Fuel setup and an R-3012 bed Mounted Chainsaw setup or of course you could get a G-1000 Rack and then get the Rack Mounted Fuel and Chainsaw accessories.