I just bought a few of those.I'm having a hard time remembering, but I'm thinking they were M12 x 1.25- 60mm length... tensil strength 10. I am NOT positive...Toyotaspeed may be correct. It is one of the 2. Anyway, I'll check my reciept when I get home from work tonight.
Do you not have 1 you can compare to? O'Reilly's has a bolt measuring thing to measure the thread count.