From the first model year until now, the wiring harness is already in, inside the passenger side hatch in the back. All you have to do is plug it in. The cd changer is supposed to include the mounting screws. The entire job takes about 10 minutes. BTW, you might want to get an extra changer magazine. They are pretty inexpensive and it saves a trip when swapping out CDs.

I used to know the speaker size but that bit of information is gone. Someone in the audio forum would know.

Enjoy

__________________
...Tracy

'00 ML320 "Casper"
'92 400E "Stella"