This is the bracket for your GM D70 Dually, it actually fits! The D70 was used by all of the Big 3 automakers at one time or another and they all had different uses and designs specifically for them. These are for a GM D70 Dually only! These are for DRW axles, SRW axles have a different offset.

Both the Dodge and Ford have different flanges and tube diameters. There are several variations of  tube diameters and flange patterns. So there is no one size fits all for Dana 70's  

We really like these Disc brake brackets here at 4wd Factory. They're very heavy duty, laser cut and formed from 3/8" thick steel.  They are bent to the correct offset and bolt right up, no spacers needed! These make the Disc Brake Conversion easy! 

• Note:  This will not work w/ 16" Dual Rear Wheels due to clearance issue between the wheels and Calipers.  You will need at least a 17" (or larger) wheel for Rear Duals. (we have kit specifically for Rear Duals)
• Use the 72 - 87 Chevy 3/4 Ton Rotors (front 4x4) & Calipers. (79 and earlier use a 7/16" brake line fitting bolt, 80 and later use a smaller course tread metric line fitting bolt.)
• Use 76-78 Cadillac Eldorado calipers if you want e-brake calipers.
• Rotors hole diameter will need to be opened  (~3/16") to slip over the hubs.
• Unpainted.
• Sold in Pairs.