The Peterbilt 379, 386, and 389 12 Inch Seat Base Adapter is a practical and beneficial product for owners of Peterbilt trucks. Available in chrome or billet aluminum, this yellow adapter is designed to fit most Peterbilt 379, 386, and 389 Seats Inc. Legacy Lo Seats built after July 1st, 2018. With its easy installation and compatibility, this adapter provides a convenient solution for upgrading your truck's seating system. Enhance your comfort and functionality on the road with this reliable seat base adapter.