This front engine insulator set fits Mack Universal and Mack E6 applications and is sold as a pack of four identical units. Installed between the engine and frame, it isolates vibration and cushions engine movement to limit noise and stress carried into the chassis.Interchanges:Mack 20QL313MMack 25154868This unit is sold in packs of 4.FeaturesFront Engine InsulatorSold as a pack of 4 unitsFits Mack Universal applicationsFits Mack E6 applicationsTech SpecsFitment: Mack UniversalFitment: Mack E6Pack quantity: 4