This insulator ships as a set of four identical units for Mack Universal applications. It acts as a non-conductive buffer within the assembly, cutting down on heat transfer, vibration, or noise between the components it separates. The four-piece pack lets a shop replace a full set at once rather than sourcing individual pieces.Interchanges:Mack 20QL231P11Kenworth K066-218Kenworth K066-228Kenworth M300-70NRFMT-4908This unit is sold in packs of 4.FeaturesSold as a pack of 4 unitsFits Mack Universal applicationsSold by Pro Gear and TransmissionTech SpecsSell pack: 4 piecesFitment: All Mack Universal