Just a quickie
if i was to upgrade my front brakes to standard 4x4 saph cossie size i could use my calipers but with the caliper brackets and disks (of course ) off a saph cossie? or do i need the saph calipers and hubs too ? anyone ?

 

best to use disc and caliper coz the size ov the caliper on 4x4 will be smaller and cossy discs bigeer wont brake on all discs just part ov it

 

you'll need the saph hubs as well as the calipers and the discs as they are of a different offset to the xr ones
you'll also need to return to using cossie wheels, again, due to the offset of teh brakes

 

or use 2wd cossie disks and 4x4 cossie calipers

the disks will fit fine, but the clearance is tight so if you giving it some the disks expand and touch the caliper a bit.

a Little angle grinder work will sort it