This insulator is a practical and versatile product designed to fit most miscellaneous makes and models. With a width of 1 1/4", inner diameter of 4 7/16", and outside diameter of 5 13/16", it provides excellent insulation. The small width of 13/16" ensures a snug fit, while the polyurethane material guarantees durability. Sold by pair, this insulator is a reliable choice for various applications. It is also compatible with OE parts, specifically Mack 20QL1171.