What are you claiming that "circular" object is on the car to the left of Fedora Man? That "circular" object is a tail light/brake light. The circumference of this object is far too small to possibly be a headlight. And that same circular object matches up with the circular object that we see on the car in the National Geographic snippet mentioned above.
Dear Sonderführer Storing,
Charles is right that the "circular object" is the photographed-from-an-angle-and-therefore-reduced-in-size taillight of your 1958 Pontiac Bonneville "Abandoned Getaway Car" because we can also see the end section of the design feature that Car and Driver magazine described below as "the Buck's [as in Buck Rogers'] Battle Squadron rocket shooting along the full length of each side, complete with little chrome diamond shock waves in the
white-painted "exhaust"Seventeen and a half feet long, it can stand a lot of gazing upon. The "New Direction Styling" of this "Bold New Pontiac"—"the boldest advance in 50 years," asserted the ads boldly—featured Pontiac's first dual headlights, which were echoed by twinned taillights. There were dual exhausts, too—two sets of them. Fake ones pierced the huge rear bumper for fifties-era excitement, and real ones were hidden down below, where they wouldn't stain the chrome. Speaking of chrome, the traditional silver streaks may have been gone, but there was no shortage of sparkling-bright plating. Tons of the stuff highlighted every line of the body, making sure you noticed the pillarless roofline, the false air venting at the rear of the canopy, the wraparound fighter-cockpit windshield shape, the Buck's Battle Squadron rocket shooting along the full length of each side, complete with little chrome diamond shock waves in the white-painted "exhaust". . . why, a person could flash clear out to Mars in this wondrous thing!Look at how small the taillight looks in this photo, for crying out loud.
https://i.vgy.me/QqYqHS.jpgAnd in this photo you can see "Buck Roger's Battle Squadron rocket shooting along the full length" of your 1958 Pontiac Bonneville "Abandoned Getaway Car" -- and the wide, flaring, white-painted rocket "exhaust" near the end which can be seen on the car in the Wiegman clip, proving that your "Abandoned Getaway Car" was there the whole time!
https://i.ibb.co/6ccmKRWm/Car.jpgThe fact that the "circular object" (the passenger-side taillight of the 1958 Pontiac Bonneville "Abandoned Getaway Car") seems to line up perfectly with the taillight / brake light of some rando car "across the street" in Wiegman is just an example of the planets being in alignment in the anomaly-replete tragedy known as the JFK Assassination.
Speaking of rockets, rocket exhaust, and planets, you should be exiled to one of The Outer ones (e.g., Uranus), Sonderführer Storing.
-- Tom