A longer and larger flange mount to allow the 31158 Eastwood Fender Roller to be used on trucks and cars with larger (5" to 6") 5 & 6 lug bolt patterns and up to a 4.25" center hub. Simply remove two bolts from the 31158 Eastwood Fender Roller, switch to the Truck Adapter, replace the bolts and go. Eastwood Fender Roller Adapter