As far as I know... they're random... But they mostly appear in
the middle or right marker... What you can do is turn off the
autosave, so if you don't get the car, you can just reload the
profile and re-race the rivals again... however, you'll have to
remember to save frequently...
Another way is to pick the centre one first, it's got a higher
chance in my opinion, then you still have another chance, so pick
either the one on the left or right... 50/50 chance...
So far I managed to get all the cars except the Evo, which isn't a
problem cos I'm using the Cayman S, which is much better...
heh...