Top hat design for mounting links above the differential. This design allows for double triangulation of your 4-link Rockwell axle. Our design does NOT use the 3/8" inspection cover bolts of other designs. Instead, we incorporate 12 of the 1/2" bolts on the bearing flanges. Underside gusseting adds further strength and rigidity. Sold as a weld together kit with top plate of 5/16" steel and 3/8" steel side plates. Generous flat area of 11 3/8" x 12" for mounting tabs to the front steering axle. Front and rear designs integrate the Wilwood caliper and Mazda rotor pinion brake. Mazda rotor bore must be machined larger and the bolt pattern redrilled to fit the Rockwell flange. Machined rotor available. Link tabs NOT included. Please contact us for any questions.