This is a A-31R500 Piston Rings PN: 31R500Main Description As Following : A-31R500 Rings, Piston P.N: 31R500 Overbore 3-1/8" To 3-1/4" Crossed From: PRS159 , Found in Section & Models : Engine Parts > C123 CID, Case-IH TRACTOR: SUPER AV (SN 310300>), Case-IH TRACTOR: SUPER AV1 (SN 310300>), Case-IH TRACTOR: SUPER C, Case-IH TRACTOR: 100, Case-IH TRACTOR: 200 Associated Items : New Also A-IH-O-SUPAAV, A-IH-O-SUPAAVL, A-IH-P-ACCESSORY, A-IH-P-SUPA, A-IH-S-TOUCHCTL, A-IH-O-SUPA1AV1, A-IH-P-SUPA, A-FRM-IHOL, A-IH-C-MUSCLES, A-IH-O-ROTCUTFH, A-IH-O-SUPC, A-IH-P-ACCESSORY, A-IH-P-IMPCSUPC, A-IH-P-SUPC, A-IH-P-SUPCIMFH, A-IH-S-CARBSPEC, A-IH-S-ENGGASE, A-IH-S-SUPERC, A-IH-S-TOUCHCTL, A-IH-S-TUNEUP And : Overbore 3-1/8" To 3-1/4"