Want to change your OEM seat to an aftermarket seat? Need more leg room? This seat base adapter allows aftermarket seats to adapt to the existing OEM drill pattern in the floor - no additional drilling required. The seat base adapter also allows up to 7-1/2" of adjustment in 1" increments, providing extra leg room for tall drivers. Adapts to nearly every aftermarket seat. Billet aluminum construction. Stainless steel hardware included.  

12" wide, designed to fit Peterbilt 579 models with Seats Inc Legacy Lo seat manufactured July 2018 and older.