FYI a police car wont necessarily always have a "K" code as the 2nd digit.

The K code denotes a car that is equipped with a police package, which is generaly what larger agencies ordered as fleet cars, but back then departments could specify police equipment ala carte and simply order a standard PH, PL, etc car and spec it out to their needs or budget. For example, they could get a car with a spotlight or a reinforced roof but not get a HD cooling system or brakes.