I have a spare set of 5.25" speakers that were in the back of my 318is when I bought it.  They fit under the stock covers but I also have the covers that came with them.
Sony Xplod XS-R1343
4 way
peak power: 160w
rated power: 35w
impedence: 4 ohm
They sounded great, I just put some larger speakers in the back and I already had good fronts installed.  These should fit in the rear or front of a 318is.
Asking $20 plus a little for shipping?  Or there are a few parts I need that I might like to trade towards / for...
- Good blank check panel (w/ srs if it matters)
- Shifter console w/o window lockout button hole (if there's one that'll fit an airbag car)
- If not the above... a nice looking window lockout button
- Defroster button
