It looks like the kits for sale on eBay are the OEM kits. I purchased a kit from a seller named Harvey (HarveyPNP@comcast.net was his e-mail address a few months ago.) Most opinions are that the Harvey kit is superior to the OEM, but I have not personally made a comparison.
You might want to find someone in your area who has installed the rear speakers and check out whether you think the improvement will be sufficient to justify the investment. I think it is. I also added a 6-channel amp from a 911 cabriolet and replaced the front dash speakers. Those three modifications took the sound from bad to decent, but I've heard better systems. I have a 986, so there may be a different outcome with a 987.
Here's a link to some installation instructions that might help you make up your mind: http://www.pelicanparts.com//techarticles/box_rear_speakers/box_rear_speakers.htm
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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