Distributor Cap Delco Inline 6 Cylinder | Sierra 18-5386 Sierra Delco Inline 6 Cylinder Distributor Cap | 18-5386 Distributor cap for 6 cylinder inline marine engines with Delco conventional ignition distributors. Fits inline 6 cylinder Delco distributors with points and condensor Replaces Mercury Marine, Mercruiser 33765 and 33765T Replaces OMC 980152