In MY88 there was a low-end radio for the basic 900 without any possibility to install equalizer
or cd-player (looks the same as MY86-87, but different partnumbers). S/Turbo had the high
specification radio unit and all turbos had the equalizer, CD-player was optional. In MY89
the low-end radio was replaced with a simplifed version of the high-end and installed in 900/
900S/9000S. This radio were able to connect with equalizer/cd-player but they were both optional.
See Broschure MY1989 for more pictures and detailed information on the headunits.
Headunit (900Turbo/9000Turbo + 900S MY88)
Headunit (900/900S/9000S MY89-91)
Headunit (900 MY88) - Low End, not compatible with equalizer or CD-player
Extension cable, Headunit to CD/EQ (900 Only)
Partnumber 95 28 217, note the extra white-connector for ground cables. Also possible to use
the MY92-94 12-pin DIN-cable (Yellow) and extend the two ground cables yourself.
Optional Three Component Stereo (9000 Only)
Limited to 9000 only due to lack of space in the 900 to put three units, but some people have
done it anyway, check out here