Wilwood 120-11136 Forged Superlite Internal Caliper Wilwood Forged Superlite Internal (FSLI) Racing Brake Caliper (Part # 120-11136) &gt; Fits 1.25" Thick rotors &gt; Features Four 1.75" Pistons &gt; Works on both the left and right side of the vehicle Great for use in Street Rods, Street/Strip, Rally, Road Racing, Dirt Late Models, Dirt and Pavement Modifieds, Drag Racing, Sprint Cars, Midgets, Off-road racing, and many other high performance & industrial applications The Superlite caliper series is the benchmark in short track, late model, modified and open wheel competition. It also enjoys prominence in a variety of road-race, off-road, rally and sport driving applications &gt; The new FSLI model series is the latest innovation to this Superlite family of calipers It has been redesigned with internal fluid ports that eliminate the external fluid cross-over tubes, along with any potential problems that could arise from a damaged tube &gt; The transfer tube has been replaced with two additional bleed screw assemblies which allows this group of symmetrical piston bore models to be mounted either right or left in a leading or trailing position FSLI calipers are a direct replacement for all Wilwood Superlite and similar competitive brand calipers with 3.50" centered mounting tabs &gt; FSLI calipers use the same 7420 type bridge bolt brake pad used in all Superlite 6 piston calipers