This cab insulator fits All Mack Universal applications and is sold individually, built as a replacement for the cab body parts group. It functions as a non-conductive buffer that helps limit heat, vibration, or noise transfer between mounted components. The design is a new construction rather than a duplicate of the original part.Interchanges:Mack 20QL30340-315D290DT290FeaturesInsulator, new design constructionFits All Mack Universal applicationsSold individually (each)Tech SpecsUnit of Measure: EACHFitment: All Mack UniversalUsed in this Mack modelBell Housing Components