The Roadworks Peterbilt Unibilt 4 Pack Bushing Set is a practical and essential product for Peterbilt 379 and 389 Glider Trucks. Made of durable rubber, this set of 4 bushings ensures a secure and reliable installation for your exhaust kit. With two 4 packs required for a complete installation, this product offers convenience and efficiency. Trust in the quality and compatibility of this bushing set to enhance the performance of your truck.