This is a A-PR129 Piston Rings PN: PR129Main Description As Following : A-PR129 Rings, Piston P.N: PR129 138 CID Engine Overbore 3-3/8" To 3-9/16"149 CID Engine Overbore 3-1/2" To 3-9/16"3 comp rings .098" thick; 1 oil ring .190" thick Crossed From: HC470230092 , , PRS127 , , PRS170 , , 230092 , Found in Section & Models : Engine Parts > C263 CID, Case-IH TRACTOR: 560 (ENG SN <36693), Case-IH TRACTOR: 560 (ENG SN 36694>), Case-IH TRACTOR: 660 (ENG SN <38981), Case-IH TRACTOR: 660 (ENG SN 38982>), Engine Parts > 138 & 149 CID Gas, Allis-Chalmers TRACTOR: D10 (SN <3501), Allis-Chalmers TRACTOR: D12 (3001>), Allis-Chalmers TRACTOR: D15 (EXCEPT SER II SN 9001>), Engine Parts > 138 CID Gas, Allis-Chalmers TRACTOR: D10 (SN <3500), Allis-Chalmers TRACTOR: D12 (<3000), Allis-Chalmers TRACTOR: D14 Associated Items : New Also A-AC-O-D10D12, A-AC-O-D10D12E, A-AC-O-D10SIII, A-AC-O-IMPLHITCH, A-AC-O-MARKTEN, A-AC-P-D10D12, A-AC-S-D10D12, A-FRM-ACCACO, A-SMAC201, A-AC-O-D10D12, A-AC-O-D10D12E, A-AC-O-D10SIII, A-AC-O-IMPLHITCH, A-AC-O-MARKTEN, A-AC-P-D10D12, A-AC-S-D10D12, A-FRM-ACCACO, A-SMAC201, A-AC-O-D14, A-AC-O-D14LATE And : 138 CID Engine Overbore 3-3/8" To 3-9/16" 149 CID Engine Overbore 3-1/2" To 3-9/16" 3 comp rings .098" thick; 1 oil ring .190" thick