Summit offers different sized bolts for this application if you don't want to grind them. They also offer the torx bit if you don't have one.
Not sure if this is the same situation, but I recently was working on a brand x engine. The bolts for the ATI damper were separate. They offered the drive bit for sale with the bolts. I have torx bits. Just not the correct torx bits. Had to buy the bit after the fact. The bolts require a torx40+, not the same as a t40, or a tamper proof t40. None of my tool trucks stock that bit, but all can special order them. So, if the tool is offered, get it.
