Mk3 van would be 1.6diesel mate,made from 1980-85.

If,as I think it maybe what your looking at,a mk5/6 van (1990-1995) mk5 (1995-2002).

It's tough to tell externally but as long as there's an underbonnet pic you should be fine,usually a big intercooler sitting on top of the motor.

Beware loads of people put that it's a td in the ad when it's straight diesel.