8 1/4 rear end question ????

Hey Guys,

I talked to the guys at Wilwood today and was asking if they had a set-up
for rear disc brakes for a 8 1/4 rear end.This is what he told me and Im not sure of every thing but it kinda went like this. If my 8 1/4 has Dana 60 flanges they have a kit for it but I would have to change to the "green stripe axle bearing" Thats where he lost me !!! This is going on my sons 73 Duster Could anybody explain this to me in terms that a BIG DUMMY can undestand.He made it sound like all we would have to do is change out the axle bearing because it has something to do with the off set. Am I even close to getting this. Im sure some body out there can help me out...

Thanks, Bob