If going coil sprung (90) - the one to avoid is the 90 Turbo from around 1986. You need either the non-turbo (1985 ish or earlier) or the Tdi 300 (1994 onwards).
Also - if looking at a vehicle that has had chassis repairs, make sure they have been done properly. I have seen some very dodgy welding on rear cross members - nasty if you plan to tow anything heavy.
The pre 1986 2286cc Diesel is also not one of their best engines - worn ones emit huge clouds of smoke on start up.
