I used new bolts, but not longer ones. The difference in length is minimal, there's plenty of thread on the stock bolts to hold the caliper on. I've got atleast 5 thousand miles on my FSVT brakes with no problems. Sorry to hear what happened and I am glad you were not hurt.

1999 Silver Frost SVT #609 of 2760 Quaife, lightened SVT Flywheel, SPEC stage II clutch, removed resonator, k&n drop in - various other goodies too.