Not much to say, if you're doing a new driveline, you should probably do new bolts too. The best out there, simple 10mm ARP chromoly with a 12 point head. We've also included Nylock nuts that also have a flange head. Due to differences in differential flanges that use 10mm bolts, these are a longer bolt that may not always be required. The extra length is not typically a problem. We do provide washers to use when required. It it not common to need to cut the bolts shorter as most differentials have plenty of clearance behind the flange.