Genuine Mazda Part
Genuine Mazda replacement radiator drain plug. There are two sizes of these plugs. This is the early version from chassis number 134425, with the thread measuring approximatly 11.82mm in width. This only applies if the radiator is the original one. If it has been replaced at any time, then you need the smaller version, SI2170.
Fits all Mazda MX5 models 1989>1992 up to chassis number 134425