This is a driver's side seat rail that was used in an Impreza GRB. n sport N Sport It was used with a bottom-mount full bucket seat from Sparco. The front and rear movement is not stiff and it works normally. If you prepare side adapters, it can also be used for side-mount full bucket seats. GRB GRF GVB GVF are listed, so it can be used without any problems, but I don't know about other applications.