Sorry if I am incorrect but this is what I think.......
2.0 petrol A model
2.5 Diesel A model
2.8 Diesel A model
I don't really know much about these....Sorry.
98 - 99 VX introduced B model
2.0 litre petrol (Sport & LWB)
2.2 Diesel (Sport & LWB)
3.2 Petrol (This one I am not sure of, possibly LWB only)
I may be wrong but I think AC mainly (Possibly, only!!) was in the 2.2 Olympus, 2.0 RS Sport and maybe 2.2 Diesel RS Sport. I think that the Olympus was the only one with leather interior.
As for your purchase, my own opinion is that you are better off going for a B series
Sorry if I am mistaken with any of the above.
Thanks,
Huw.
Owner of 'Maisey Daisey' aka Frontera LWB 2.2DTLi! Model year 2000.