Franklin Engineering's SR20 rocker arm stopper kit is suitable for all RWD SR20DE and SR20DET.
The rocker arm stoppers act as a fail safe measure under high rpm where the rocker arms have tendency to jump out of place.
The rocker arm stoppers fit directly on S13 SR20DET. It can also be used on all S14/S15 SR20DET models, but they may need trimming and cutting out some materials underneath the valve cover near the oil cap area that hits the rocker arm stopper.
Parts from Franklin Engineering Ltd. are such a great price because we are designers, the manufacturers and the seller of the parts - there is no middleman or resellers. You're buying top quality direct from the manufacturer.