This is a Bride seat rail for the driver's seat. Model: M35 Type: RH Code: N123 Parts List: B I intended to use this for a Skyline PV35 sedan, but I ended up not using it. Therefore, I don't know if it can be installed in a Skyline. The label indicates it's for an M35 Stagea, so please check the compatibility yourself. If anyone is interested in using it, please do.