/forums/images/icons/grin.gif is the flange necessary, no, several other folks here have done this without installing a new wheel ring. But IMLAO it adds strenght and provides a truer and more stable wheel mounting surface.and yes it is the standard eight lug, but them wagoner folks can make then in about any config. you could want. as for the cost it was $250 for the pair plus shipping ($60 round trip) it wasn't the cheepest by far but i feel i got my moneys worth. i checked with several local shop and they said they could do it, if i told them what to do /forums/images/icons/crazy.gif , i didn't feel comfy with this and ending up with a set of worthless hubs that will cost $700 to replace /forums/images/icons/shocked.gif. also if you do go with them and you use the DRW rotors the holes must be reemed out to 43/64 to accept the new studs (dorman part# 283). if you go with wagoner give'm a call and ask for Casey and tell him the cool box guy sent ya (you can see part of the box in the pic).