Well, that was the last part to put on the engine to make my rebuilt complete... So I took out the thermostat from the bag, try to installed it but I realized that it wont fit, its way too big. I go back to the place I buy it and they tell me that its the only part available now, they can't have the one I needs. So the guys told me that sometimes people just cut the bigger one (the one I have) to make it fit. Is this makes sense? Did one of you have done this before? Don't wanna have some coolant issues later! The part number I have is : 3083167 (Polaris) What you think?