I only had to drill and tap one hole. The other hole for mounting was already there from the stock bracket. I think the drill and tap was 8mm. Take off you rear sets and bracket and confirm size of the standard hole that is there. If you don't feel comfortable with a drill and tap, a machins shop will do both sides for about $25. All you have to do is remove the Bandit brackets and have the GSXR rear sets there for alignment. It will take only 30 minutes to complete this job.....plus you putting the rear sets and shifter back, brake, etc on.