Most body parts are exclusive to the 600 so I doubt you'll be able to interchange the grill
with another body. A good chrome shop can probably repair and re-chrome yours for less
than a new one.
I highly recommend you check with Tom Hansen at the MB Classic Center in Irvine CA for
parts. Tom is the parts supervisor and knows or can find out more than anybody about parts availability. I've heard that Euro headlights are currently unobtainium.
As for your suspension, the air bellows are the least of potential problems. The major point
of potential angst are the leveling and main control valves. The system is actually extremely reliable, just remember to always keep the suspension antifreeze reservoir supplied with ethyl alcohol to prevent damage to the valve seals. I've had my air suspension car for over 12 years
and have never had a problem, even if the car sits for a month or more it doesn't drop even
Your greatest resource for help and advice is going to be The International M-100 Group, (The International M-100 Group
For your hydraulic system DO NOT use ATF, it will cause extreme problems ($$$$$) with your
hydraulic valves and seals. Check with the guys in the M-100 Group for what to use ( probably MB
hydraulic fluid), collectively they know everything you could possibly want to know.