Omix proudly offers replacement brake components for your Jeep that meet or exceed OE standards for quality so maintaining optimum braking performance has never been so easy! This replacement brake master cylinder fits 41-45 Ford GPW/ Willys MB and 46-48 CJ2A models with Serial Numbers before number 215649. The mounting bolts are 3.0625- inches apart (center to center) with front mounting hole being threaded, rear hole is unthreaded. The cylinder piston bore is 1.125 in. with a .4375 in. inner diameter Includes boot and fill cap. Replaces OE part number 8123176
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