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The Wilwood XRZ4R left/right caliper with 1.50"/1.50" pistons is specified for use with a 0.810" disc. This paired caliper description clarifies that both sides use equal 1.50" pistons and are compatible with thinner 0.810" rotors, supplying the dimensional pairing needed for installations using that rotor thickness.
Wilwood Caliper Type III Ano L/R XRZ4R 1.50in/1.50in Piston .810in Disc
