Corvette is generally still part of Chevrolet (Europe is the exception). Cobra needs to be removed; it's not a brand. Brabham, Bowler & Chevron should be removed (in my opinion) because they are racing companies. Mopar definitely needs to be removed; it's a term referring to Chrysler Group in general.
There should be AMC, Tatra or Gaz, or Trabant if you want something more obscure, then moskvich or some old american ones, like Studebaker or Duesenberg.