After another round of research, I've found some interesting things.
FIrst off, I found real retro LAFD Swift Water Rescue. The 1 year, 7 months long hunt is over.
As a result of this, the current SWR will be reassigned back into a plug buggy, and be used as an equipment trailer hauler.
The plan now is to implement a boat trailer script into the mod and use the ambulance as the main SWR vehicle starting now.
There's more though. I've managed to find a 1992+ LAPD Ford Bronco.
I'll definitely start work on this ASAP. Prior to this, the belief was that LAPD only ran Blazers and Ramchargers.
Third, I came across some vehicles that I am uncertain about. Could be LAPD but this was taken during the riots and shows some other agencies like RTD police.
LAPD might have used 1992 Crown Victorias as unmarked cars, but not as patrol units. However it could just as well belong to RTD police who operate the white Ford Taurus in the last photo.