I´ve often wondered, being the Can-Am 370 Qualifier/MX are 84mm bore. Will the piston for a 400/406,(84mm bore), work in the 370, or is the pin located lower in the piston(to account for the decrease in stroke,(66mm vrs 72mm stroke)? If the same piston is used, then the jug must be shorter on the 370 or the jug on the 406/400 taller.. Which is true? Is the jug the same? Or are there two different pistons? Anyone know?