Dan Matthews of Highway Patrol (Broderick Crawford) also drove a ‘58 Buick. Probably a Super with a Police package.
Back then, Buicks still had Dynaflow transmissions, which meant no mechanical coupling, just the hydraulic turbine. (By that time, I believe they had automatic variable pitch, so you could feel a shifting effect.)
Dad’s second new car (after the ‘47 Chevy) was a ‘51 Special, followed by a ‘55 Super hardtop. Later, Mom bought a used ‘57 Super.
The family of a high school buddy had a ‘58. He left the rear right passenger door open in the garage one day, and then his mom got in and tried to back out. Oops!
Shoot! You can’t tell from the pic whether there’s three for four portholes!
Given that it was Perry Mason, I’m sure there were four.