MRP Stan's Better Boost Adapter Kit If you're converting to Boost wheel spacing on your Stan's wheels, you'll need wider end caps, and to add a spacer to your rotors, so they'll meet the calipers in the right spot. If you're in such a predicament, have no fear! MRP makes it easy with their Better Boost adapter kit for Boost spacing. The kit includes two end caps, a 5mm 6-bolt spacer and a set of 6 bolts. There are options compatible with either Stan's Neo or 3. 30/ZTR front hubs, letting you convert from 15x100mm to standard 15x110 Boost spacing. Features Kit includes two end caps, a 5mm 6-bolt spacer and 6 rotor bolts Forged aluminum built to withstand heat and abuse Precision machined to give you smooth rolling and braking performance | Mrp | Stan's Better Boost Adapter Kits 3. 30/ztr 15X100 6-Bolt Front Hubs