Rocker Arm Screw Lock Nut OEM 240Z 260Z 280Z

New OEM genuine Nissan rocker arm screw lock nut. Cylinder head lock nut will fit Datsun 240Z, 260Z, and 280Z, 1970-78. Will fit L series engines, including L16, L18, L20, L24, L26, and L28 engines. See #37 in diagram.