It seams like if I remember right the whole issue is the rotor is further away from the axel tube when you do this convertion correct? Also ive heard that the backing plate bolt patern is the same from the ff to the sf corect? in that case why not just, use one of the offse 3/8" think bracket in conjunction with one of the bracket spacers? Seems to me like it ought to be plenty strong. anyone else have an opinion on the mater?