Omix proudly offers replacement brake components for your Jeep that meet or exceed OE standards for quality so maintaining optimum braking performance on your Jeep has never been so easy! This replacement brake master cylinder fits 48-66 Willys models with a Serial Number after 215649. The mounting holes are 3.5 inch apart center to center and are both unthreaded. Includes boot and fill cap. Replaces OE part number 8126738