The Peterbilt 379, 386, and 389 12 Inch Seat Base Adapter is a practical and versatile solution for Seats Inc. Legacy Lo Seats. Available in chrome or billet aluminum, this adapter is designed to fit most Peterbilt 379, 386, and 389 seats Inc Legacy Lo Seats built after July 1st, 2018. Its crystal white color adds a touch of elegance to your truck's interior. With its easy installation and compatibility, this seat base adapter offers convenience and functionality for a comfortable driving experience.