I seriously doubt that anyone on here has one for sale but I thought that I'd check.

Take a set of Chevy 3/4 ton 8 lug D44 or 10 bolt front rotors, calipers and caliper mounting brackets.
Knock off the dust shields from the caliper mounting brackets.
Tear the 14 bolt down to the bare spindles
place something over the spindles to protect their threads, bearing surfaces, and area the oil seal mates on
remove the drum brake backing plates
remove the drums off the hubs by driving the studs out of the hubs with a brass drift and BFH
Not sure about 14 bolts but on Dana axles you install the turned rotor on the rear surface of the hub, you may have to obtain new studs with longer grips to engage both the rotor and hub
carefully slip the bare caliper mounting bracket on the spindle
reinstall the hub and rotor assy - the bracket is sandwitched between the rotor/hub and flange that the old backing plates bolted to.
Install a set of loaded calipers on the brackets and rotors, bleeder valves oriented down
hook up some flexible brake lines between the calipers and single hard brake line
have two friends align the caliper/bracket assemblies (I prefer a trailing edge orientation)
apply dry nitrogen to the brake line thereby clamping the calipers to the rotors. This in turn causes the brackets to properly align
carefully weld the steel caliper brackets to the flange and you have a disk brake conversion (8 lug) on your full floater axle for a minimal cash outlay....

Why buy or fab brackets when GM already made a sanitary set for ya? Some applications might require slight grinding of the brackets for fitment purposes.

E-mail me and I can send ya pics. Already converted a Dana 70U out of a 85 F350 and a Dana 80 out of a 98 Dodge 2500. Dana 70U is in a 86 Bronco, bolts right in except for 1 inch shorter drive shaft. Dana 80 was installed in my 95 F250. I've seen the conversion done on 14 bolt axles too. Works real fine and lasts a long time. Just like yer grandpappy's Timex.

JR