I would suggest getting ahold of Tony Karl of River City Equipment, Qweens Way, Fairbanks Alaska. He was the 'middle-man' for WESTERN Geophysical, a sizemic survey company that operated a fleet of two dozen of these. When they off-loaded the fleet he ended up with a truck load (containers, full) of parts and a dozen machines. He had, and probably still has, thick, Aluminum Diamond Plate floors that were a custom retro fit one piece aluminum, not a standard Bombardier part. Probably lots of other stuff, like tires, wheels, grousers,....
the entire fleet had been retrofitted with GM 6.2 liter diesels (originally 318 Chryslers). Thru him you can likely find a machine and quite a supply of parts. It was some years ago, but he had the wheel set for the front, transmissions, and the drive-line too. 'Western Geco' had retrofitted their fleet for Arctic Oil Exploration work with the diesel and 3 fuel tanks on the roof that held a total of 330 gallons of fuel. They were said to be capable of 40 to 45 MPH. I have a picture of a row of over a dozen machines lined up at his place taken about 1995. Fun to drive in new deep power. Steered kind of like a boat, some time delay in the response.