I'll have to go back and re-read to get the exact wording, but I believe the rules state that the car specs are based on the model "as delievered" to the US, or, in other words, based on US models only.

Someone feel free to correct me if I'm wrong...

So, a spec part that was NOT offered on a US model of the car would not be considered a legal part...

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Darin E. Jordan
SCCA #273080, OR/NW Regions
Renton, WA
ITS '97 240SX