QUOTE(glennboysst3 @ 19 Dec 2009, 02:07 PM)
<{POST_SNAPBACK}>they WILL NOT have two differant part numbers etc etc for the same item !!
will keep you posted on this as its ongoing .
hes normally pretty accurate with all this as he deals with it all day long so fingers crossed he will shed some light on this matter for us all.
My initial thoughts too from my knowledge of Ford part numbering procedures and discipline. I did even bring up the fact that the plugs share the same maunufacturing part number, the pricing difference at the dealer is because the plugs they sell for the ST in service have a different part number than the original factory fit ST/RS plugs.
However there is some info from Wolfman that there are some codes on the body of the plug which differ between the ones taken out of ST's and those from RS's. Having looked at the RS plugs i've still got in a box here I think he meant where there are 3 very small numbers stamped on the metal plug body. If this is the case, how Volvo would ever manage this in their engine plant and error-proof the different stock would be interesting to know!