The all new Nagisa Auto D-LOCK Super Low Seat Rail adds 'zero-play' of the seat rail and slider with a Double Locking Mechanism. Adjustable low positions, and will fit most standard size bucket seats. For 1989-2002 Nissan Skyline R32 R33 R34The D-Lock double locking mechanism features seat rail locking for both sides when using the adjustment slider. This is ideal for a firm zero-play hold onto the seat for competitive driving environments.Slider uses ball bearings for smooth slide adjustment. Universal fitment will fit standard size bucket seats. This seat rail has a low profile and fits a variety of seats. (Recaro SPG/ SPG3, Sparco Corsa-Rev2, Bride) This will not fit wide seats.