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SSBC's rear disc brake conversion comes as a complete bolt-in kit, including the mounts and hoses, 11-inch vented one-piece rotors, and single-piston calipers with parking brake provisions. The rotors are double-drilled to accept either the stock pre-'73 A-Body's small wheel bolt pattern or the more common 5 on 4-1/2 inch bolt pattern. Swapping to the big bolt pattern requires either custom axle shafts or precision machining modifications of the stockers. Since wheel choice is limited with the small bolt pattern, our plan was to upgrade to the big bolt pattern at the same time as the brake swap.