I purchased a couple of the plastic BMW mirror housings to modify.
I'm looking at a camera called the INNOVV C3.
http://www.innovv.com/
It's supposed to be designed for motorcycles, but might work in this application.
It looks like the cable to the lens can be extended even longer than the cable that is supplied with the camera. I'd like to mount the recorder in a readily accessible location, perhaps inside the console armrest storage compartment.
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2008 E91 36K, 6-speed, RWD, Alpine, Terra, Xenons, ZSP, ZCW, ZPP, PDC, CA, alarm, M shifter and M brake handle, Euro rear fog light switch, Euro aspheric mirrors, rear power outlets, Euro split armrest, Lidatek, remote V-1, Cocomats, beach sand, $10 clutch stop mod. 1998 Volvo V70T5 226K, 5-speed, original clutch (third clutch pedal!), aspheric driver's mirror, E-code headlights, IPD sway bar, strut tower brace & skidplate.