Hello,
As a giant fan of "The Rockford Files", I own the series on DVD and noticed a car that I could not, at first, identify.
It can be seen on the 1st season's finale, episode 22: "Roundabout" from 28 minutes in.
It is silver and parked in front of a mansion. It is filmed from the driver's side rear quarter. After matching it up with pictures online, it is a Maserati Bora. The model years could range from 1971-1975.
You have a wonderful site that I have used many times to ID things, so I just want to give back, as you do not feature this one in your list for this Rockford episode.
Frederick H. Crook