Added the impala. St.Regis, Diplomat and Pulsar were already listed and have been added in comments.
Added, initially, Rabbit-Golf as unknown (other Rabbit already listed with 1*) if this one were 1986+ so it would be Golf
To see in http://www.imcdb.org/movie_83437-Knight-Rider.html the cars with 1* must be selected in "Display Options: All Vehicles".

Done and thanks.

By the way: all your pics (except Impala) were 800X600 (too big). Next time, please, no more than 720X576.

Actually it's a 1981-85 model becuase of the grille.

It is. 1980 at the oldest.

The first picture looks like a Chevrolet Impala.

Hi,

Some background vehicles taken from 6th episode of the 3rd season (KITT vs. KARR)

Chevrolet Caprice



Dodge St. Regis



Dodge Diplomat



Nissan Pulsar



Volkswagen Rabbit



Regards