Disc Brake just wondering?

[zapper]

Hi all
I know a lot of guys have converted to Disc brakes either by doing the full crossmember swap or by just the control arm and spindals, I am wondering if anyone has ever been able to change over by finding some disc caliper brackets that would work on the original spindals? I have a 64 GMC the front end is tight and in good condition. Does anyone make brackets so you can use your original spindals and just buy rotors and calipers? Thanks
Ang