Why don't car companies remake some of their classic car models if people like them so much?

Of course safety is in mind because everyone would freak out if they didn't have a seat belt and air bags in every inch of the car, but why can't some of the companies just remake their best selling car models? Dodge could remake their 1948 Sedan and Ford could remake their 1949 Custom. I could list more but I can't think of any more classics.

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