More information can be seen at these sites: 
 http://1bad6t.com/idplate.html

Body, Chassis And Soft Trim Part Number Groupings
 

Group Number              Part name Group Number              Part name
   
1000-1999---------------------- Hubs, drums & wheels 15000-15999--------------------Clock, cigar lighter
2000-2099-----------------------Brakes 16000-16999--------------------Front fenders & aprons
2001-2200----------------------Brake shoes 16100-16599--------------------Radiator support & splash shields
2100-2199-----------------------Brakes 16600-16999--------------------Hood, latch, hinges, ornaments, retainers
2200-2299-----------------------Brakes 17000-17299--------------------Speedometer & cable
2300-2399-----------------------Brake booster 17300-17399--------------------Speedometer & tachometer
2400-2999-----------------------Brake pedal & linkage 17400-17599--------------------Windshield wipers & washer
3000-3499-----------------------Front axle & suspension 17600-17999--------------------Bumpers & mirrors
3500-3599-----------------------Steering gear 18000-18399--------------------Heater & shock absorbers
3600-3999-----------------------Steering wheel & column 19000-19999--------------------Air conditioner & related parts
4000-4599-----------------------Rear axle 20000-20999--------------------Weatherstrips, interior mldgs & front doors
4600-4999-----------------------Driveshaft 18400-18999--------------------Radio, speakers & antenna
5000-5199-----------------------Frame 21000-21999--------------------Front door windows & all door mechanisms
5200-5299-----------------------Muffler/Exhaust 22000-22999--------------------Front door latches & handles
5300-5399-----------------------Front springs 22050----------------------------All lock sets
5400-5999-----------------------Stabilizer bars 20000-20999--------------------All mldgs (exterior) & stripe kits (all)
6000-6999-----------------------Engine tag & pulley ID chart 23000-23999--------------------Front door handles & window regulators
6999-7999-----------------------Manual trans, linkage, clutch 24000-25999--------------------Center pillar, rear door & windows, weatherstrips, mldgs
7000-7999-----------------------Auto trans, linkage, coolers, etc 26000-26999--------------------Rear windows, lifts & latches
8000-8499-----------------------Radiator, grill, cooling 27000-27999--------------------Rear window regulators & qtr panels
8500-8599-----------------------Water pump 28000-28999--------------------"B" pillar
8600-8999-----------------------Fan 29000-29999--------------------Quarter glass, interior mldgs & weatherstrips
9000-9299-----------------------Fuel tank & lines 29000-29999--------------------Exterior mldgs & attaching clips
9300-9399-----------------------Fuel gauge & pump 30000-39999--------------------Quarter glass, weatherstrips & interior handles
9400-9499-----------------------Manifolds, thermostats & emission related parts 40000-41999--------------------Rear liftgate, tailgate and trunk compartment
 9500-9999-----------------------Carburetor 42000-42999--------------------Back glass
9600-9699-----------------------Air cleaner & related parts 43000-43999--------------------Tailgate, mechanism, latches & hinges
9700-9799-----------------------Choke accelerator linkage, speed control 44000-49999--------------------Tailgate glass, rear package tray & window regulator
10300-10599--------------------Alternator, pulleys & related parts 40000-49999--------------------Decals, transfers, exterior mldgs & attaching clips
10600-10999--------------------Battery & instrument panel parts   50000-50999--------------------Roof & convertible top mechanisms
11000-11999--------------------Starter, lamp & ignition switches 51000-51999--------------------Roof support rails, weatherstrips & console
12000-12999--------------------Coil, distributor & spark plugs 52000-52999--------------------Roof supports and bows
13000-13399--------------------Headlamps, parklamps, turnsignals 53000-59999--------------------Convertible top mechanism & luggage carrier parts
13400-13699--------------------License, tailamp and brakelamps 50000-59999--------------------Exterior mldgs & attaching clips
13700-13999-------------------Courtesy, instrument panel lamps, switches & horns 60000-60999--------------------Seats, hinges & supports
14000-14399--------------------Main wiring harness & window regulators 61000-61699--------------------Seat side mldgs, seats, seat belts & headrest
14400-14499--------------------Taillite wiring & battery 61700-61999--------------------Seat tracks & attaching parts
14500-14999--------------------Wiring, circuit breakers & fuses 62000-69999--------------------Seat side mldgs & ash trays