Building a new bike tonight ... I'm installing XTR post mount brakes on a Magura Thor and the XTR mounting bolts are too big. I'm making the assumption I can just buy some Magura bolts and they will work. 2 questions:

1. Is my 'assumption' correct; can I use Magura bolts with the XTR caliper? Specifically, I'm concerned about a large difference in bolt-head size.
2. Anyone know the best place to check to buy the Magura bolts on-line?