Nissan Poly Gearbox Mount Specification Heavy duty uprated polyurethane gearbox mount for 200SX/Silvia and Skyline. This mount is a direct replacement for the standard item but is much stiffer holding the engine and gearbox steady. This gives a more direct feel and sharpens up throttle response as you're not waiting for the tired and sloppy standard mounts to twist and compress before turning the propshaft. Fitment list : Nissan 200SX & 180SX S13 RS13 PS13 RPS13 (CA18DET & SR20DET) Nissan 200SX S14 S14A Nissan Silvia S15 Nissan Skyline R32 GTS-T