My 2003 S also came with only dash speakers and the CDR 23 radio. No amp, no door or rear speakers. I bought the dealer kit around 2006 and installed it myself following the instructions in this Pelican Parts how-to article. The article has been updated and now says the kit is no longer available but the separate parts are and it lists them with the part numbers, including one for the wiring harness. I remember when I did it, the kit came with two plugs, one for cars with an amp and one for cars without an amp. I hooked something up to the plug for cars with amps by accident and it took me a long time to find out who made the internal connector pins/clips and buy a replacement one to fix my mistake! So don't do that! Good luck, maybe with the part number you can find a used harness, hope this is helpful.
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Current: 2022 718 Cayman GT4, PDK bone stock (the dark side).
Former: 2003 S, 3.6 LN Nickies, ARP rod bolts, under-drive pulley, Fabspeed sport headers, Softronic tune, 987 airbox 987 motor mount, Function-First Sport motor mount insert, Ben's short shifter, Nine8Six projector headlights & center caps, ROW M030, stainless flexible brake lines, B-K rollbar extension & fire extinguisher mount, hardtop
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