Sierra International 18-5278 Tune Up Kit - Delco EST V6 Sierra Tune Up Kit Contains 18-5408 Rotor, 18-5362 Distributor Cap Sierra part number: 18-5278 Interchangeable with the following: GLM 71820, Mallory 9-29321, Mercruiser 850484T3, 850484T1 Fit specific, check part numbers to ensure proper fit