The Mack Insulator Kit is a practical and efficient solution for insulating your vehicle. Made with high-quality polyurethane, this kit includes everything you need for installation, including 8 PL1017 insulators, 8 washers, 4 3/4"-16 x 5" bolts, and 4 locknuts. Designed to fit OE parts such as Gaff 12035, Mack 204SX389 (Rear engine - Fuller & Allison Transmission), and PAI FKT-5069, this insulator kit ensures a secure and reliable fit. Improve the performance and longevity of your vehicle with the Mack Insulator Kit.