write the model # down and but the exact same motor. you can go to brigs and stratton.com with any mounting pattern questions. they have a num yoy can call with specific questions. i beleive you can e-mail em too. did the engine seize or something? it might not have damaged anything if not. drain and refill with fresh oil. i have heard good and bad things about the ohv inteks, but in general, briggs are pretty hard to kill. we had one in the back yard when i moved in to my present house that the previous owner had. the gas cap was missing. after the mower was tipped over and the water ran out of the gas tank from the rain, we looked inside the tank and it looked like black goo, almost like tar in the tank. just for fun we put some fresh gas in it, and after about 10 hard pulls, the critter fired off and smoked like a tire fire for a minute or so then cleared up and ran fine. got a kick out of it. you can imagine what the oil loked like. i doubt it was ever changed at all. outside with no cover or gas cap. change the plug on yours when you do the oil. do you have a northern hydralics store in your area? they also carry alot of different motors in stock, and what they don't have, they can probably order.....penz