This is a A-892604M1 Piston Rings, Hydraulic Pump PN: 892604M1Main Description As Following : A-892604M1 Piston Rings, Hydraulic Pump P.N: 892604M1 Sold in multiples of 4 (used w/ A-190799M1 piston).Inside Diameter: 21.5mmOutside Diameter: 23.9mmWidth: 2.3mm Replaces: A-VPK1202 MISCELLANEOUS , 190848M1 MASSEY FERGUSON , Crossed From: HM892604 , Found in Section & Models : Tractor Parts Associated Items : New Also This is An Aftermarket Product And : High Quality Afternaket Shipped from Both US and Canada