Cheers for the reply!...

...The thing is I couldn't verify all of the needed specs (see initial post in here) in the url's you provided me with!...My ST 170 is kinda "tuned up to the max." lets say, so it's rather crucial that I'll find some decent spark plugs with those specs really!...So far I haven't found any matches unfortunately, and I'm gettin' rather tired / desperate, because I am like one breath away from my final programming / dyno!... :-/