run some queries in the data bank, using the search function at the lower right. Try inputing the various model numbers: E.g., SC 815, SC 816, SC 901... The SC 815 and 815 in-unit amplification, and have tape and in-dash single CD, and will also drive external Volvo or Alpine 6-cd changers. The 900 and 901 need external amps, have some additional features, and are otherwise simlar to the 815/816 re tape, and 6-cd changer capability. However, the SC 901 ( and, I think, the SC 900) have a three-cd in-dash changer which requires a unique magazine which costs about the same as the three cds you can load into it. the 6-cd magazines for the external changers on all are apparently generic Alpine, and can be found readily on eBay.
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We have met the enemy and they is us. [Pogo] S70 T5 cop car : Rough Rider suspension, Walmart fog lights, eBay speakers, ambiance by Pall Mall, trim by Le Duc d'Tape, 8-channel THD by OEM amps

Hi,
Any SC radio is compatible with the mount & wiring config in your car.
The dealer replacement program is basically a "trade-in" allowance for purchasing a way over-priced unit from the dealer. Better to go with e-Bay since a lot of 850 & V70 owners have opted for MP3 players and have their old SC radios collecting dust on the work-bench. As far as I know all of the SC models were black, and the differenced in the model #'s relate to function/feature only.
FYI, these radios were all manufactured by Alpine and are basically very good units (I still use mine.)
Good luck!
Armie
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'94 850 154000kms '86 760GLE 272000kms 95 Silverado4x4