I have not researched or confirmed these part numbers but they are what RightGear & Axle list in their ebay ad.
This info may be of use later.

Quote
The RightGear & Axle Disc Brake conversion brackets adapt the 2000 and up GM 14 bolt Disc Brakes with integral parking brake to the 1973-1987 style non-slip off drum 14 bolt axles. Includes brackets and bolts pictured only, you will need to supply used or new parts from the backing plate out from a 2000 and up 2500HD or 3500HD.

From your local parts store:
(2) BD125656 Wagner Brake Rotors
(1) QC785 Wagner disc pads
(1) PAB771 Wagner Shoe Set
(1) 15-4729 Caliper
(1) 15-4728 Caliper
(16) 610-189 Wheel Studs

From GM:
(2) 88965717 Plate kit
(4) 15016308 Caliper Bolt
(2) 88965732 Lever

Well I did check the Dorman studs listed 610-189.
9/16-18 - .622 In. Knurl, 3 In. Length
Application: Chevrolet & GMC 1999-71

And the rotors listed are for lots and lots of late model GM vehicles, might be same as came on the axle I have?

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-