Vintage design Austin Healey 100-4 Le Mans distributor vacuum. Concours quality. These units are built from the original Lucas components and have upgraded internal diaphragm for improved performance. Each Lucas unit is correctly stamped with the original part number and include the correct threaded vacuum line fitting. Important there are two options available and you must determine which unit you require. Early LeMans distributor 40422 uses the lever pin connection vacuum 420755. The later Le Mans distributors 40520 use the spring link vacuum 421994. Please check your distributor for correct application.