US Army, Technical Manual, TM 55-2810-218-20P, ORGANIZATIONAL MAINTENANCE REPAIR PARTS AND SPECIAL TOOLS LIST: AIRCRAFT, RECIPROCATING, (LYCOMING), (FSN 2810-600-4666), O-480-1, (2810-764-5961), (O-480-1A), (2810-109-4578) (O-480-1B), (2810-893-3013), (O-480-3), AND, (2810-109-4577), (O-480-3A),