These are some speakers I found that match the classic 900 extremely wellThey also fit the 9000 and 9000 cs very wellWill fit the front or the rear without any additional effortI'll install them for you if you're local to me .. or fancy the effort of visiting for a coffee to talk classic 900'sBeware I have got a PhD in boring for England on the subject  They will update the sound of even the oldest stereo  Not one complaint about my speaker choices .. (perhaps I know a bit more than I thought)  20 sets sold in totalTHESE WILL FIT IN A C900 WITHOUT FOULING THE SPEAKER GRILLES4" (10 cm) 2-Way Coaxial Car Speaker160 wattHigh Grade Glass Fibre ConeHigh Grade 1" Kapton Voice CoilMulti-Directional Neodymium Tweeter4 0HM ImpedanceSensitivity: 90 dB (1W/1M)Rubber Magnet BandChrome Finished T-yoke CoverFits all models Convertible (front only) Hatchback Sedan 2 3 4 and 5 doors (front and rear) 1979 - 1993SAAB 9000 AND 9000 CS CD AERO GRIFFINFRONT ONLYbest wishes Steve