6mmx70mm, 1.25 pitch (I think). I am sure about the diameter and length, just not the pitch. But I'm almost positve it's 1.25. 6mmx60mm should work too. And grab a bunch of flat washers, and two fender washers (big O.D., small I.D.), so the bolts dont slip through the puller holes
What I did was took one of the timing cover bolts to the hardware store and matched up to that thread. worked like a charm. Spray some oil in the holes before installing.
I have the puller from harbor freight, and I just dealt with this yesterday.
Good luck!