I may be a newbie to this forum but I can add some details on the patrol cars from this series and from The Blues Brothers plus Smokey & The Bandit.
Most of the lightbars used are Federal Signal’s early model AeroDynic, their attempt at making a still tall but more aerodynamic lightbar. These lightbars had a center speaker piece before the emergency lighting companies decided to switch to all-light equipment.
The ‘squarer’ lightbars are Federal Signal’s TwinSonic, nicknamed the ‘Flying Brick’ due to their shape, and was known to cut somewhere between 5 to 10 mph of the top speed of a vehicle that had it as the lightbar.
The Hatchapee County Sheriff’s Department cruiser which showed the back of it’s lightbar also ID’s the TwinSonic as being one that was used in California or Utah (their TwinSonics by 1977 were red and blue, with a rear-facing amber flasher for the red side.) while the one with 2 beacons is either Federal Signal’s Twin Beacon Ray or the Twin VisiBar
TwinSonics were also used in The Blues Brothers, by the Illinois State Police (some cars had Twin Beacon Ray lightbars while the other cars including the Chicago PD Mopars had Mars’ SkyBolt.)
Smokey & The Bandit saw only 3 types of lightbars in the whole movie: a Twin VisiBar without a center speaker used on Buford T. Justice’s car; CJ184 4-lens beacons used by the Georgia State Patrol plus Alabama State Patrol and TwinSonics used for the Arkansas State Police, Deeson County Sheriff’s Office, Mississippi Highway Patrol and Atlanta City Police.