Hcr32typem, I always assumed that the wiring on Cefiros was the same as Skylines, so imagine my surprise when the plug turned out to be completely different. Apparently from what I can determine, Series 1 Cefiros basically have silver top RB20s with redtop wiring. Series 2+ are the same as a Skyline. Makes no sense, but that's the hand you're dealt sometimes.