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10. The rear disc brake kit was purchased from DoctorDiff. This kit uses Ford calipers and an 11-inch vented rotor. The DoctorDiff kit is designed to work with the stock tapered roller axle bearings. With the rotor removed, you can see the DoctorDiff caliper brackets are machined from billet aluminum. The brackets are the correct thickness to use the OE end play adjuster.