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The Wilwood XRZ4R left/right caliper with 1.38"/1.38" pistons is specified for use with a 0.810" disc. This paired caliper option indicates symmetrical 1.38" pistons on both sides and compatibility with 0.810" rotor thickness, offering the dimensional match for brake setups that utilize that thinner disc specification.
Wilwood Caliper Type III Ano L/R XRZ4R 1.38in/1.38in Piston .810in Disc
