Welcome Hammer Wagon. I have this quest in my life to know everything about the older amg cars. When I first came to this forum, I searched everything on hammers, and I read for 24 hours straight...so I know what thats like. My dad had a mercedes when I was a kid, but we didnt get another until two years ago. I found out about hammers, and thats all I look for all day long every day.
Wheels: AMG Hammers came with 17x8 ET28 wheels called AMG AERO I. Tires Pirelli P700 215/45/ZR17 front and Pirelli P700 235/45/ZR17 rear, you can actually still buy these tires. They are rare though. They make them in these sizes and a few more. Your car came with 16s stock. The wheels in the picture are stock for your car. You are missing the side skirts like you said though. I think that your car was in the car and driver. I heard that there was a wagon in conneticut owned by an old lady.
Engine: Your car is called the 300TE 6.0 AMG. THe hammer is only distinguished as the W124 car. They both have the same engine M117. See for money saving purposes to make the Wagon affordable (yeah right) they used the SOHCs, but they are high lift long durration cams. They did this instead of using the 65k dollars DOHC heads for the reason listed. Althought the block of the hammer and the 6.0 L wagon is the same. Its the M117 aluminum block bored out to 100mm with the 560 crankshaft 94.8 mm stroke. Since it is an aluminum block with some type of other metals, boring it out is really hard and I think that they didnt do it right so that is why they scar, etc. The DOHC heads are cast and they have air pockets in them and then they leak oil and coolant into the spark plug holes and other locations. Oil leaks out of the heads on that black hammer that was on the forum a while back, thats probably why they haven't sold it.
History: There were a 170 DOHC 6.0 L engines and some 5.6L with the same heads on them. There were 13 AMG hammers made. Some of the DOHC engines were also put in W123 and W126 cars. The baby hammer, the 190E had the same engine as your wagon has 6.0L SOHC, there was only one ever made.
Suspension: Put on 500E front shocks for the weight, put on 500E front and rear sway bars. How big is the front sway bar? I have no idea about the self leveling suspension, but I bet that maybe you could find info out if you looked for a w126 car with self leving suspension because I think the pump is on the block directly. Is this correct? For the springs, maybe you could put on an Eibach set for a 500E, I am not sure if they would fit because I think a 500E has SL suspension. Maybe 400E springs would fit.
Lights: I think that 500E euro lights look really nice. This is Aldemon's car. He is a member of a forum that just got a red 500E, and he has the black one for a daily driver.
http://photos.yahoo.com/bc/aldedmon/lst?&.dir=/My+Photos/Dedmon+et.al&.src=ph&.begin=9999&.view=t&.order=&.done=http%3a//photos.yahoo.com/bc/aldedmon/lst%3f%26.dir=/My%2bPhotos/Dedmon%2bet.al%26.src=ph%26.view=t
I have hella lights on one side of my car and bosch on the other. The bosch is vacuum adjusted to get it to the right level I had to do some modifications because the car vacuum sucks the lights up.
Fenders: Look up SUBMAN or DTM FAN, they are the masters of fender rolling.
http://web.tampabay.rr.com/actionfit/fenderolling.html
Make sure that your paint is in good shape and that there isnt any rust behind the lips of the fenders before you do this.
I would call your car 1990 Mercedes Benz 300TE 6.0 AMG, unless you want to call it something different.
Have fun on your new journey,
Austin