JEGS 10 & 12-Bolt GM Rear Disc Conversion Kits combine some of the best features available to make your selection and installation easy. Our kits include all of the brackets and flanges for the Small GM (4-bolt) housing ends in addition to large GM calipers with pads and integral parking brake, brake cables, 11.14" rotors with 2.786" hub I.D. and perfectly machined holes for 5 x 4.5" BP utilizing 1/2" studs and 5 x 4.75" BP utilizing 7/16" studs, brake hoses and mounting hardware. Also available for standard (for coil springs with both shocks behind rear axle) or staggered (for leaf springs with one shock forward of and one shock behind the rear axle) set-ups and as a Premium Kit with cross-drilled and slotted rotors plus braided stainless steel hoses.