Do not know this plug.
Your car came with a 4 side electrode plug. The Bosch part number is FGR 6 KQC.
The 2.5s use a 2 sideelectrode plug, Bosch FR 7 LDC4.
I think the 987 has a nickel-yttrium plug, Bosch FGR 5 KQEO.
Can you post a picture of the plug and the box?
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