you know, that's what i've always thought, and i still actually think that. but i had a weird occurance when i was rebuilding my motor. i used the bell that came with the 4 banger t5. after i had everything together, i was trying to rotate my motor by hand to set my rockers, and it wouldn't turn at all! turns out it was because my flywheel was catching on something inside the bell! i was freaking out thinking something inside the motor wasn't right, so i started taking everything off backwards in order that i had just put it together, and when i got the bell off, the motor would rotate just fine. so i switched it out to one of my other t5 bells and everything was good after that. i dunno what was up, they look the EXACT same.