Vintage design Austin Healey 100-6 3000 distributor vacuum 420755 fitted to DM6 distributors number 40532 usually found on 1957-1962 models up to engine 29FH3562. 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.The original DM6 distributor is part number 40532 and can be found on the outer case. Early DM6 distributor uses vacuum 420755. For later Austin Healey 6 cyl models check our store . DM6 vacuum units have a pin link. Please check your distributor number to determine if this is correct vacuum your vehicle.