This is a A-PR181 Piston Rings PN: PR181Main Description As Following : A-PR181 Rings, Piston P.N: PR181 A-PR181 Rings, Piston P.N: PR181 Replaces: C5NN6149AA FORD , Crossed From: C5NN6149AA , Found in Section & Models : Engine Parts > 172 CID Diesel, Ford / New Holland TRACTOR: 4000 (DIESEL 1964), Ford / New Holland TRACTOR: 800 SERIES (DIESEL 1964), Ford / New Holland TRACTOR: 900 SERIES (DIESEL 1964) Associated Items : New Also A-FO-O-MAJOR4000, A-FO-O-2-5000, A-FO-O-2000, A-FO-O-24000IND, A-FO-O-24000RC, A-FO-P-ACCESS, A-FO-P-MAJOR, A-FO-P-234000, A-FO-P-4CYLALL, A-FO-S-DATA, A-FO-S-ENG158, A-FO-S-SELECTO, A-FO-S-2000, A-MNL18259, A-SMFO20, A-SMFO31, A-FO-O-600800, A-FO-O-601-801, A-FO-P-ACCESS, A-FO-P-SHERPS And : High Quality Afternaket Shipped from Both US and Canada