This cab insulator is sold as a pack of 4 identical units and fits Mack Universal applications. It acts as a non-conductive buffer that helps cut down on vibration, noise, or heat transfer between the cab components it separates.Interchanges:Mack 20QL250Mack 25158280FMT-4900This unit is sold in packs of 4.FeaturesPack of 4 insulatorsFits Mack Universal applicationsTech SpecsSell pack: 4 piecesFitment: All Mack UniversalUsed in this Truck Cab modelMack Cab Exterior & Mirror Parts & Diagrams