They're all Mk 2 4x4 wheels but I didn't realise that they were also produced in two sizes. Unless someone says otherwise, I think the tyre spec for the 4x4 was always 145/80 so I'm not sure why they changed them. Later FWD cars had the optional 155/65 tyres and hence the wider wheels (as Vern says). I have a set of Mk 1 4x4 wheels which are 4" and have put 155s on them without a problem.