Now this is really hard for me...
Potthin is still a Toyota dealership, but I am quite sure they bought those parts from the company I am still looking for.
So you are not really wrong.
I hope the other puzzlers will not grill me for this, but I herewith award Oguerrerob one point for his intensive search and his persistence. He found one of those cars, that were marketed under different names obviously.
So there is still one more point to get here
