Continuing with the update, all of the front speakers are in. I mounted the 6 1/2" woofers in the OE enclosures in the doors...with a little trimming away of excess metal on the speakers, they popped in beautifully and I sealed them with the butyl stuff and used the OE screws to hold the speakers in their enclosures. I used the old speaker wire to pull the Monster Cable wires thru the chassis; worked like a charm! Note: while the door panel's are off, I suggest putting a light locking compound on the threads of all screws/bolts back in there...the stereo vibrations tend to work things loose (the wood inlays on my door panels were almost falling off!).
I have a set of MBQuart tweeters (although not a match to my set, they'll do for now) which I mounted above the 4" speakers in the dash on pieces of metal strapping. I wanted to play around with them, point them in all sorts of directions, and see where they sounded best. Frankly I think they sound great pointed at the windshield a little towrds center; and if kept like this, they'll fit under the OE grills! I'm going to reserve final judgement for when I hook up the correct tweeters, which should be in within a week.
Lastly, the crossovers were tough but a stuffed one up under the dash on the driver's side (Bri, you were right!) and the other I fit under the plastic panel under the passenger's feet. No cutting was necessary, so that worked out well.
Now just waiting for the other two amps to arrive; looks like I can start on the subwoofer project. So far so good!
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Best regards, Michael
'92 500E
'88 300TE