I've been watching the original Mod Squad series from 1968-73, and it's really such a good show. Though the show centered around Mopars starting in 1970, there has been the same 1968 Tempest showing up in the background of various episodes throughout the series run. Because of this, I thought that car may have been significant enough to be like a producer's car that they used as a background vehicle or one of the cast's personal car, something like that. I went to IMCDb (Internet Movie Cars Database) and I did find the car, but was very suprised to only find one bad still of it, and no other pictures or lore around it.

Not sure if anyone's even watched the Mod Squad, or even noticed that Tempest, so this might be a long shot to get any info on that car. My keen eye has just been seeing it in like every second or so episode from the start of the show to the end. Surely there's some story behind it.

Looks like this internet one,

Good eye! We saw many movie cars/race cars this weekend at the POCI convention. 2 were built for the TV show, one lives here in Michigan and the other is in Australia. The 1st time in 60yrs the Monkee Mobiles have been together. Vin Deisel's GTO from his movie and many more.