Engine Oil Pump. Sealed Power. 50161, 601-1066, 601-1621, 6011621, DM66C, EM66, EM66C, EP66C, HM66C, M-66C, MM-66, Oil Pump, OP320C, OP66. To confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in theCompatibility Table.