I listed the Explorer in The World Is Not Enough, but as for the others:
Renault 14 Police car in A View to a Kill: Can already be seen in the entry for the police van, is it worth listing?
BMW 3 in A View to a Kill: Appears on screen for about half a second, not sure if it's worth listing. See thumbnail below.
Ford Mustang in Octopussy: Too small and not noticeable enough to be listed.
Ford Capri in Octopussy: Only visible a fraction of a second, and probably wasn't a rare car at the time. Not worth listing in my opinion.
Chevy Caprice/Chevy El Camino in Octopussy: Possibly worth listing but I ignored it when I was doing the film because Caprice was a very common car in the 80s (in the USA anyway). See thumbnail below.
Grey Opel Ascona (I think it's really a Mk3 Escort) in The World Is Not Enough: You must be joking
Hardly anyone would notice it in the film, it's passing by as Pierce Brosnan crosses the road, side of the car is visible for a fraction of a second.
Ford Transit in The World Is Not Enough: Already visible in the entry for the Vauxhall Omega police car and extremely common in the UK, so no listing for this.
Mini in For Your Eyes Only: Appears only very briefly as the camera pans past it. But the Citroen CX gets the same amount of screen time and that's already listed (not by my choice though). See thumbnail below.
The rest of the vehicles, I'm not sure about, here's the thumbnails for them and I'll let others decide:
They're all taken from my DVDs. Robi's captures may be larger but they are much lower resolution (probably expanded from a non-DVD source), so we should use mine instead. Perhaps one day someone will come along with the Blu-Rays and give us captures from them. To be honest Robi, I think we've got all the vehicles worth listing in the Bond films already listed.