The Mack Insulator Kit is a high-temperature polyurethane insulator kit that is sold as a complete kit. It includes 8 PL1017-HT insulators, 8 washers, 4 3/4"-16 x 6 1/2" bolts, and 4 locknuts. This kit is designed to fit most Navistar/International makes and models and is compatible with OE parts such as Gaff 12034, Mack 204SX216 (Mack Transmission), and PAI FKT-4603. With its durable construction and comprehensive components, this insulator kit provides practical and reliable insulation for your vehicle.