hi all, i want to use my z20let hks iridium spark plug which is name S35i. i entered hks europe.com i cant see the z20let i saw c20let or other engines they are avaible but i didnt see z20let so if it is useful for c20let and other models it could be useful for z20let. i mean are there big differences between these engines and z20let engines spark plugs.