I saw this pic on Facebook recently. It illustrates perfectly how car makers can take one basic platform and set of sheet metal, and turn it into 15 different vehicles. I made a post to that effect
a while back, and this pic fits it to a T.
Here Chevy displays 15 cars all based on the b-body, on one basic platform. Factor in all the additional models from Buick, Olds and Pontiac (and maybe a Cadillac or 2?) and you can see the genius of GM back in the day.
While some Cadillacs and the Olds 98 and Buick Electra were c-bodies, most of GM's other models were b-bodes: LeSabre, 88, Catalina, and Bonneville come quickly to mind. And that's just skimming the surface.
So it's interesting how one basic platform provided such an array of options for each brand. Contrast that with just a few years in the future, and you see, by 1962, there were several new platforms added to the mix: a-body Chevelles, x-body Novas, and z-body Corvairs, to name just the new Chevys, and they still offered umpteen b-body variants in the Bel Air, Biscayne and Impala.