Thank you very much to all the people who took part in my little
"game".
Here are what I think the right results:

1) Saab 900
2) Audi 100 Avant
3) Hyundai Coupe (Tiburon in the USA apparently)
4) Nissan 350Z
5) MB W123 (I asked by mistake in my original post if this was an old
C Class but I didn't know that the C and E class were modern naming
conventions. Before 1990 the MB names were very confusing)
6) MB W126 Old S Class (Could be 500 SEL, something else I learnt the
"L" in this name stands for lang(long) and therefore has nothing to do
with the "L" in SLK where it stands for leicht(light))
7) Nissan Pickup (Navara in UK, Frontier in USA)