Tony,

GMC factory parts for P-3500 HD solid front axle trucks. Build proper sized spacer for rotor ID to fit front spindle/rear hub diameter, use companion calipers, clamp to rotor with air, build mount.

Probably need power brakes or hydrovac, min. 19.5 wheels. Not a hardware store exercise, but I'm sure there is someone in Idaho they could do that. Good luck.

Ed

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.