Enclosed lightbar choices (some model designations may be wrong, thinking of the top of my head for some of these; also have pics referencing bars that I have no idea what specific model number they are):
Federal Signal (newest to oldest for the time period of the truck):
JetSonic with chain-driven rotators, flashers, takedowns, alleys, whatever you need with center speaker
AeroDynic Model 24 (hard-to-come-by), Model 24EH (endlamp flashers, halogen bulbs), or Model 24EAH (alley lights, endlamps, and halogen rotators)
Sealed beam type AeroTwinSonic model 24R (cascade mirrors to front), 24X (criss-cross mirrors to front and back), or Model 24RVF (two rotators, V-mirrors, and inner front-rear flashers)
TwinSonic Model 12 (cascade mirrors), 12X (criss-cross mirrors), 12F (flashers on top of mirror), or later Model 12EVF (economy version with V-mirrors and inner front-rear flashers)
Code 3 (oldest to newest):
Code 3 SD (TwinSonic look-a-like) with 4 sealed beam rotator pods, optional diamond mirrors, front-rear flashers, or steady-burn lights
Code 3 XL (sealed beam type) with standard 4 rotator pods and diamond mirrors or with optional front-rear flashers or front Stingers and rear V-mirrors.
Force 4 XL (independent rotators, very popular in the late '80s) with 4 standard rotators and diamond mirrors
Force 4 XL with two slow outer rotators and two fast inner rotators (or vice versa)
Force 4 XL with 3 rotators per side
Force 4 XL with front-rear flashers and 4 rotators
Force 4 XL with front Stingers, rear flashers, and 4 rotators
LP6000 with 4 rotators, standard, fast or mixed, with speaker cover
LP6000 with 4 rotators, front-rear flashers
LP6000 with 4 rotators and Stingray modules
MX7000 lightbar with speaker cover in whatever configuration you see fit
Whelen:
Early Edge 9000 with whatever options you see fit
Advantedge, halogen, oscillating halogen, or strobe versions
Model 80 or 90 lightbars, halogen or strobe
Just for added fun, lets add these guys for a period-correct setup.
Smith & Wesson:
Their only lightbar that's commonly seen on the web and in a plethora of TV/movies with the 4 rotators, front takedowns/flashers, optional alley lights, rear flashers, and center speaker cover
Mars Signal Lighting (good luck finding these, but I'll throw 'em in anyway 'cause who knows?)
:
SpectraSystem lightbar with 2-beam or 3-beam rotator pods and flat mirrors.
SpectraSystem with 2-beam/3-beam rotators and front-rear flashers
SpectraSystem with 2-beam/3-beam rotator pods and inner 888 assemblies
Aurora System lightbars with either 2-beam/3-beam rotators and flashers, 888 center light, or all oscillating
Aurora Borealis lightbar (prepare to sell a kidney for one!)
Dietz/Signal Stat/Yankee/NAPA:
All shared design with options like 2 or 4 independent-driven sealed beam rotators, front-rear flashers, V-mirrors, or diamond mirrors
[Broken External Image]:
http://policecanada.org/policeca/movietv/NYPD1958_03.jpg
Dietz:
Dietz Omni-Chief (TwinSonic Look-a-like) with rubber belts to run rotators
As for front grill/rear flashers, a standard
par 36 housing, metal or rubber, with 4414R or 4416R bulbs will do the trick.
Dashlights:
Federal Fireball, early gear drive or with later friction drive
Federal Flashball
Federal Signal Fireball II
Federal Signal Vitalite model 121
Whelen Deputy, Rota-Beam, or early Responder
Code 3 550, sealed beam version
SVP 1166 teardrop light or SVP 1169 pancake light
Smith and Wesson L-11 pancake light
Yankee/Signal Stat teardrop-style dashlight
Dietz 7-46 beacon, single rotator
North American Signal TR series or BBP series of beacons
Sirens:
Federal Signal PA-15A/PA-20A E series, PA150, and PA200
Whelen WS-295
Code 3 sirens from the early '80s (have no clue for models right now)
Southern Vehicle Products SA400, SA450 consoles
Early Unitrol siren consoles
Dietz/Signal Stat/Yankee electronic line of sirens
That's all I've got. More will chime in with ideas I'm sure!