There's Pontiac as well, but I'm sure it will be something more obscure than that.
I'm assuming that the answer will be in Autopuzzles somewhere, so I'm not going to offer
Nondescript Seņora or
Censored porn stain.
Then I've been searching for a car called the
Sandon Eco Sprinter, and a figure from motoring history called
Dennis Crapton-Rose, but without any success.
And "endoscope" keeps falling out, but I won't labour that point.
I'm sure the right answer will turn up eventually.