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Originally it was NGK D8ES-L. The D8ES is just 1/2 a step colder. I'm not sure whether it is the D8ES-L or the D8ES that became superseded by the D8EA. Maybe someone else knows.
Excellent contribution! What Hondaman describes runs parallel with my experiences, be it that mine are limited to the use of the 500 Four. For my purpose I prefer the X24ES-U too, but, alas, can't find it in the shops anymore. A shame, because it was the better plug.What I haven't discovered yet: is there any difference in (tip) design between D8ES-L and D8EA and D7ES and D7EA respectively?