As requested, these are the IDs as shown in spawn menus in the default game.

Base.85fifthavenue - 1985 Chrysler Fifth Avenue
Base.85impala - 1985 Chevrolet Impala
Base.85impalacruiser - 1985 Chevrolet Impala Police Car (Pre 9c1)
Base.85impalataxi - 1985 Chevrolet Impala Taxi (Sign Only)
Base.85impalataxi1 - 1985 Chevrolet Impala Taxi (Sign & Adverts)
Base.85lesabre - 1985 Buick LeSabre
Base.85lesabrepolice - 1985 Buick LeSabre Police Cruiser
Base.85lesabretaxi1 - 1985 Buick LeSabre Taxi (Sign Only)
Base.85lesabretaxi2 - 1985 Buick LeSabre Taxi (Sign & Adverts)
Base.86caprice9c1police - 1986 Chevrolet Caprice 9c1 Police Crusier
Base.86capricetaxi1 - 1986 Chevrolet Caprice 9c6 Taxi (Sign Only)
Base.86capricetaxi2 - 1986 Chevrolet Caprice 9c6 Taxi (Sign & Adverts)
Base.85delta88 - 1986 Oldsmobile Delta 88
Base.85delta88police - 1986 Oldsmobile Delta 88 Police Cruiser
Base.85delta88taxi1 -1986 Oldsmobile Delta 88 (Sign Only)
Base.85delta88taxi2 - 1986 Oldsmobile Delta 88 (Sign & Adverts)
Base.87macktruckbox - 1987 Mack D680 Box Truck
Base.87macktrucklflatbed - 1987 Mack D680 Flatbed
Base.87macktrucklogcarrier - 1987 Mack D680 Log Carrier
Base.87macktrucklogcarrier2 - 1987 Mack D680 Log Carrier (No Logs)
Base.87macktruckswat - 1987 Mack D680 Swat/Rescue
Base.87fordthunderbird - 1987 Ford Thunderbird Turbo Coupe
Base.88lesabrecoupe - 1988 Buick LeSabre Coupe T - Type
Base.88riviera - 1988 Buick Riviera
Base.89cougar - 1989 Mercury Cougar
Base.89diplomat - 1989 Dodge Diplomat
Base.89diplomatpolice - 1989 Dodge Diplomat Police Cruiser
Base.89diplomattaxi1 - 1989 Dodge Diplomat Taxi (Sign Only)
Base.89diplomattaxi2 - 1989 Dodge Diplomat Taxi (Sign & Advert)
Base.89fury - 1989 Plymouth Fury
Base.89furypolice - 1989 Plymouth Fury Police Cruiser
Base.89furytaxi1 - 1989 Plymouth Fury Taxi (Sign Only)
Base.89furytaxi2 - 1989 Plymouth Fury Taxi (Sign & Advert)
Base.90beretta - 1990 Chevrolet Berretta
Base.90bonnevillesse - 1990 Pontiac Bonneville SSE
Base.90caprice - 1990 Chevrolet Caprice
Base.90caprice9c1police - 1990 Chevrolet Caprice 9c1 Police Cruiser
Base.90capricetaxi1 - 1990 Chevrolet Caprice Taxi 9c6 (Sign Only)
Base.90capricetaxi2 - 1990 Chevrolet Caprice Taxi 9c6 (Sign & Adverts)
Base.90crownvictoria - 1990 Crown Victoria LTD Sedan
Base.90crownvictorialtdpolice - 1990 Crown Victoria LTD Police Cruiser
Base.90crownvictoriataxi1 - 1990 Crown Victoria LTD Taxi (Sign Only)
Base.90crownvictoriataxi2 - 1990 Crown Victoria LTD Taxi (Sign & Adverts)
Base.90supreme - 1990 Oldsmobile Cutlass Supreme Coupe
Base.90laser - 1990 Plymouth Laser
Base.90regalsedan - 1990 Buick Regal Sedan
Base.90tornado - 1990 Oldsmobile Tornado Coupe
Base.91buickroadmaster - 1991 Buick Roadmaster Station Wagon
Base.91caprice - 1991 Chevrolet Caprice Sedan
Base.91dynasty - 1991 Dodge Dynasty
Base.92bronco - 1992 Ford Bronco
Base.92broncopolice - 1992 Ford Bronco Police
Base.92concord - 1992 Chrysler Concord
Base.92crownvictoria - 1993 Ford Crown Victoria Sedan
Base.92crownvictoriap71police - 1992 Crown Victoria P71 Interceptor Cruiser
Base.92crownvictoriataxi1 - 1992 Crown Victoria P72 Taxi (Sign Only)
Base.92crownvictoriataxi2 - 1992 Crown Victoria P72 Taxi (Sign and Advert)
Base.92crownvictoriataxi3 - 1992 Crown Victoria P72 Taxi (Front & Rear Ram Bars)
Base.92deville - 1992 Cadillac Deville
Base.92grandmarquis - 1992 Mercury Grand Marquis
Base.92grandmarquistaxi1 - 1992 Mercury Grand Marquis Taxi (Sign Only)
Base.92grandmarquistaxi2 1992 Mercury Grand Marquis Taxi (Adverts and Sign)
Base.92grandprix 1992 Pontiac Grand Prix Coupe
Base.92intrepid - 1992 Dodge Intrepid
Base.92intrepidpolice - 1992 Dodge Intrepid Police Cruiser
Base.92intrepidtaxi - 1992 Dodge Intrepid Taxi
Base.92Jimmy - 1992 Chevrolet Jimmy (Long Wheel Base)
Base.92lesaber - 1992 Buick LeSabre Sedan
Base.92lumiacoupe - 1992 Chevrolet Lumia Coupe
Base.92premiersts - 1992 Eagle Premier TSI
Base.92roadmaster - 1992 Buick Roadmaster (sedan)
Base.92towncar - 1992 Lincoln Towncar
Base.92towncartaxi - 1992 Lincoln Towncar Taxi
Base.92typhoon - 1992 GMC Typhoon
Base.92vision - 1992 Eagle Vision
Base.93aurora - 1993 Oldsmobile Aurora
Base.93gmcblazer - 1993 GMC Blazer
Base.93camaro - 1993 Chevrolet Camaro Z28
Base.93capriceclassic - 1993 Chevrolet Caprice Classic (Chrome Trim Version)
Base.93capriceLTZ - 1993 Chevrolet Caprice LTZ (Sport Version)
Base.93capricetaxi1 - 1993 Chevrolet Caprice 9c6 Taxi (Taxi Sign Only)
Base.93capricetaxi2 - 1993 Chevrolet Caprice 9c6 Taxi (Taxi Adverts & Front/Rear Ram Bars)
Base.93capricetaxi3 - 1993 Chevrolet Caprice 9c6 Taxi (Taxi Sign & Adverts)
Base.93blazer - 1993 Chevrolet Blazer
Base.93continental - 1993 Lincoln Continetal
Base.93corvette - 1993 Chevrolet Corvette P4
Base.93crownvictoria - 1993 Crown Victoria Sedan
Base.93interceptorp71 - 1993 Crown Victoria P71 Interceptor (Without Pit Bumper)
Base.93interceptor2p71 - 1993 Crown Victoria P71 Interceptor (With Pit Bumper)
Base.93crownvictoriataxi1 - 1993 Crown Victoria P72 Taxi (sign Only)
Base.93crownvictoriataxi2 - 1993 Crown Victoria P72 Taxi (Adverts Sign)
Base.93crownvictoriataxi3 - 1993 Crown Victoria P72 Taxi (Front & Rear Ram Bars)
Base.93dodgeviper - 1993 Dodge Viper GTS
Base.93elderado - 1993 Cadillac Elderado
Base.93transam - 1993 Pontiac Trans Am 4th gen
Base.93frieghtlignerambulance - 1993 Frieghtliner FL70 Ambulance (Paramedic)
Base.93frieghtlignerambulancefire - 1993 Frieghtliner FL70 Ambulance (Fire Department)
Base.93fl70box - 1993 Frieghtliner FL70 Box Truck
Base.93fl70flatbed - 1993 Frieghtliner FL70 Flatbed
Base.93fl70logcarrier - 1993 Frieghtliner FL70 Log Carrier (McCoy Logging Spawns)
Base.93fl70logcarrier2 - 1993 Frieghtliner FL70 Log Carrier (McCoy Logging - No Logs)
Base.93FL70swat - 1993 Frieghtliner FL70 Swat/Rescue
Base.93fleetwood - 1993 Cadillac Fleetwood
Base.93gmcsuburban - 1993 GMC Suburban
Base.93grandamcoupe - 1993 Pontiac Gran Am Coupe
Base.93grandamsedan - 1993 Pontiac Grand Am Sedan
Base.93lhs - 1993 Chrysler LHS
Base.93lhstaxi - 1993 Chrysler LHS Taxi LS
Base.93lumiasedan - 1993 Chevrolet Lumia Sedan
Base.93markviii - 1993 Lincoln Mark VIII
Base.93interceptorp71 - 1993 Ford Crown Victoria P71 Interceptor (No Pit Bumper)
Base.93interceptor2p71 - 1993 Ford Crown Victoria P71 Interceptor (With Pit Bumper)
Base.93sevillests - 1993 Cadillac Seville STS
Base.93suburban - 1993 Chevrolet Suburban
Base.93tahoe - 1993 Chevrolet Tahoe
Base.93tahoepolice - 1993 Chevrolet Tahoe (Pre 9c1 for SUVs)
Base.93taurus - 1993 Ford Taurus
Base.93fordthunderbird - 1993 Ford Thunderbird
Base.93yukon - 1993 GMC Yukon
Base.93yukonpolice - 1993 GMC Yukon
Base.919c1police - 1991 Chevrolet Caprice 9c1 Cruiser
Base.919c1taxi1 - 1991 Chevrolet Caprice 9c6 Taxi without Adverts
Base.919c1taxi2 - 1991 Chevrolet Caprice 9c6 Taxi with Adverts
Base.939c1fire - 1993 Chevrolet Caprice 9c4 Sedan (Fire Department Package)
Base.939c1policecruiser - 1993 Chevrolet Caprice 9c1 Police Patrol
Base.939c1policecruiser2 - 1993 Chevrolet Caprice 9c1 Police Cruiser (Pit Bumper)
Base.93capricewagonfire - 1993 Chevrolet Caprice 9c2 Fire Wagon

*Please be aware that the next patch update will have 145 vehicles showing in scripts folder. These scripts will not have functional models as I am currently working on those cars for the 1990's vehicle expansion update - this will likely increase