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If it was in the factory accessories brochure at the dealer you could order it fitted to any new car. This is a page from the 87 US accessories brochure and it lists two CD players on offer.
The funny thing is, that brochure is totally inaccurate. The pictured Porsche CD-1 didn't have an anti-theft security code at all. However, the Porsche CD-2 did!
Just to close this thread out, the CD-1 was always delivered with an accompanying Blaupunkt BEA-80. The CD-1 head unit only has pre-amp outputs, and requires the amplifier to drive the speakers.
I guess they couldn't fit an internal amplifier into the Porsche CD-1 stereo back in 1988-89.