Back in the day most tv shows had a contract with a certain car brand . The shows got a brand new car(s) for the star(s) each model year For example , I dream of Jeanie had Pontiac , and you can see Larry Hagman sporting around in a Firebird convertible . Bewitched had a contract with Chevrolet and Darren Stevens was driving a Camaro convertible in 1969 and his boss Larry Tate was stylin and profiling in a 69 Corvette convertible . The Brady Bunch had a contract with Plymouth and they furnished them with a brand new convertible Barracuda in 70 and 71 . The contract said they get a convertible so in 1972 they had to make them one by using the 71 and swapping in the 72 grille taillights etc. They did the same for Mod squad who had a contract with Dodge .I believe George Barris did the mods. Beverly Hillbillies also had a contract with Dodge and Jane Hathaway got a brand new red convertible each season .