i didn't get this bolt because i got the pulleys used. It says on their website that its 12mm by 60mm. I got a 12 by 70 and a 12 by 50. will either of these work. I know i dont have to tighten it very much, as its just a starter, but will either of the ones i got work? I also have a puller and some high temp sealant but no breaker bar, do i need one? thanx in advance