Anbody know what these are or where I can find the details without buying a shop manual (which rather defeats the object of doing the work myself if I have to spend out on that)? I've given up searching the web as, unusually, I can't easily find the answer to this particular technical question this way. Also, anyone know the part number for platinum plugs that will work OK in this model, the standard plug is an NGK zfr5j-11 (I want to "fit and forget" platinum plugs).