[ossiblue]

My experience with the early cars, pre-70, is the factory opening is a smaller rectangle with two circular holes for the knobs--like you show in the second photo. Later cars, don't know what years, enlarged the opening to the standard size of today which allows a front insertion of the radio/cassette/CD player. As I said, my experience is with cars up to 69 so maybe the 71 has the larger opening or, if not, someone may have enlarged it for a more modern radio. Others with direct experience can confirm the time the opening changed, and whether or not an adapter plate is available.