zlacker

Plastics. Those are the hard to source bits. Plastic doesn't stay plastic for ever and NOS can be dried out just as much as the bits that are in the car.

Most other things are easy to source, and anything made of steel can be fixed (zero rust, so far).

>>jacque+(OP)
1997 car with no rust? I'm guessing you don't live in an area that knows snow.

>>jandre+6k
NL, not a lot of snow but they do put salt on the roads here and it hasn't affected the body at all as far as I can see. My son drives a similar vintage E320 station and it too is still mostly rust free, the only part that seems to suffer on his car is the rear hatch.