Sold as a 2-piece pack, this insulator fits Mack E6 cab mounting locations and is made to resist oil exposure. Each piece measures 12.001 in. wide by 12.001 in. high by 1.02 in. long, forming a barrier that limits heat, vibration, and noise transfer between components. It fits in place of the OEM insulator referenced in the title.Interchanges:Mack 20QL37P6Mack 25158903This unit is sold in packs of 2.FeaturesExtra oil resistant constructionSold as a 2-piece packFits Mack E6Measures 12.001 in. x 12.001 in. x 1.02 in.Tech SpecsHeight: 12.001 in.Width: 12.001 in.Length: 1.02 in.Pack quantity: 2 pieces