Still have the mirror.

You can check to see if it will work by popping off the shroud around the mirror neck, and seeing if you have 2 wires going to the mirror or 9. If 9, it is plug and play unless you have the SOS mirror (which it doesnt sound like you do). If its 2, you can still add the mirror, you just have to add a power/ground (which is what I had to do on my e46). Otherwise, the compass and dimmer are self contained to the mirror.

Here are some links describing it

Pictorial DIY: BMW E90 HomeLink/Temp/Compass/Anti Dazzle Mirror Retrofit to E46 - E46Fanatics

Retrofit of Compass

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