actually for my e30 i didnt have to get no housing for the deck
i just pulled out the old one...and put in the new one. it fits, a bit wobbly it will come out
so i just wrapped it with electrical tape and jammed it in...its so snug its rediculous!
wiring a deck via basic connections to the e30 is so simple.
you can use the stock wires or you can fully rewire.
i've done both...fully rewire mainly because the previous owner butchered the wiring from before.
i have a sony deck was 90 bucks new at futureshop. people say its a bad deck...but once installed it was significantly louder output then stock deck on stock speakers!!! i got more than i thought out of this deck.
plus, the red lights and shit REALLLLY compliment my color scheme it was amazing meant to be!
here is a pic the closest thing i got to the deck...minus the actually control unit itself...you can still see the connector to it etc.