This is a Ford 9" housing with C10 brackets made to fit your application.
 
NOTE: Moser 1973-1987 Chevy truck spring perches will not work with QA1 coil over kits. The perch is too short. 
 
1973-1987 C10
Stock Width - 63 3/4" Wheel Mounting Surface To Wheel Mounting Surface
Perches Welded In The Stock Location
3" Tubes / 1/4" Wall - Seamless DOM
31 Spline Moser Engineering Bolt In Style Axles
Nodular Iron Case
Truetrac Posi
Choice of Gear Ratio
1350 Yoke
Sealed Ball Bearings
11" Disc Brake With Parking Brake
14" Braided Lines Included
Parking Brake Cables Hooked To Caliper, Trim To Fit Design Lokar Kit