The Wilwood 160-7104-BK is a left-hand (driver-side) SRP Drilled Performance rotor from the UL32 line, measuring 12.19 inches in diameter and 0.810 inch thick, with an 8 x 7.00-inch bolt pattern. The SRP design uses a directional cross-drill and face-slot pattern, which the manufacturer says helps the rotor face shed pad glaze and release gases and heat at the pad interface. Each rotor is cast iron with a black e-coat for corrosion resistance. Compared with a plain stock rotor, the drilled-and-slotted face gives a sportier, more responsive pedal feel in spirited street and sport driving, and the iron construction is a practical budget option over exotic rotor materials when you need a serviceable upgrade. Search terms this part matches include Wilwood SRP drilled rotor, 12.19 x .810 8x7 left hand rotor, Ultralite UL32 iron drilled rotor, and driver side drilled slotted brake rotor.
Fitment depends on the hub and caliper setup, not the rotor alone. The 8 x 7.00 bolt pattern and the 12.19-inch diameter must match your application, so verify the hat or adapter and the caliper before you order. Wilwood's assembly sheets show the rotor bolting to a separate hat or adapter, with the caliper bracket shimmed so the rotor sits centered in the caliper. Owners on user forums report that drilled rotors can develop heat checks and cracks under heavy track use, so plan to inspect them regularly and replace any cracks that spread toward the edge.
The LH designation in the part name identifies it as the left-hand (driver-side) rotor. The manufacturer's install guidance should be checked against your hub before ordering, since a mirrored position will not seat correctly.
Wilwood describes the black e-coat as a corrosion-protection finish. Owners on user forums report that the coating wears off the friction face during pad and rotor bedding, while the coating inside the vanes, slots, and drilled holes remains and is normal.
Owners on user forums report surface heat checks on drilled rotors and say cracks can appear quickly under hard track use. Heat checks are generally tolerable until they reach the rotor edge, so inspect the rotor after every track session.
This is an intermediate install for a driver comfortable with brake work. You will need a torque wrench, thread locker, a dial indicator or runout gauge if you want to check hub-to-hat seating, and shims if the caliper needs centering. Wilwood's assembly sheets call for bolting the rotor to its hat with thread locker and a torque in the 25 ft-lb range, but torque values change by kit, so use the sheet supplied with your hub and caliper. Seat the hat flush against the hub, because a gap can increase runout, and check wheel clearance so there is at least 0.080 inch between the wheel and caliper. Keep the rotor and caliper centered before final torque. Bed the pads and rotors according to the manufacturer's procedure, and avoid stopping on a hot rotor during the bedding process.
