We have modified a cast-iron Dorman master cylinder that is much more robust than the factory master cylinder, and significantly less prone to the inner wall wearing. This replaces the original Land Rover Clutch Master Cylinder, and our direct drop-in replacement kit includes the modified Dorman Clutch Master Cylinder, along with the braided stainless steel line to replace the factory "hard line" running from the master cylinder to the junction/union located on the bulkhead wall. Fit's late-IIA & III Series (1971-1984) and pre-Puma Defender (1983-2006).