YC2F-12B579-BA
The first part of the number indicates the decade.
The second number is the year in the decade the part was first used.(0-9)
The third number is the type of car
1000-1250 = Wheels, hubs and drums
1350-1499 = Spare wheel carrier
2001-2285 = Brakes (service)
2307-2438 = Brakes (power)
2442-2482 =
Brake controls
2505-2900 = Brakes (parking)
3000-3359 = Front
suspension and steering linkage
3500-3764 = Steering gear
4000-4296 =
Rear axle
4600-4859 = Drive shaft
5000-5176 = Frame
5200-5299 =
Muffler & exhaust pipe
5300-5499 = Front spring and stabilizer
5550-5832 = Rear spring
6000-6898 = Engine
6905-6968 = Transmission
overdrive and engine steady rest
7000-7997 = Transmission (Automatic or
Manual) and Clutch
8000-8499 = Radiator and grille
8500-8689 = Water
pump and fan
9002-9296 = Fuel tank
9301-9420 = Fuel Pump
9421-9499 = Manifolds, clamps, etc.
9500-9599 = Carburetor
9600-9699 = Air cleaner
9700-9999 = Accelerator and choke control rods
10000-10449 = Generator and Alternator
10500-10653 = Voltage
regulator
10654-10756 = Battery
10838-10990 = Instruments
11000-11382 = Starter motor
11450-11688 = Lighting and ignition switch
12000-12390 = Ignition coil, distributor, condenser
12402-12425 = Spark
plugs
13002-13248 = Lamps (head and parking)
13402-13796 = Lamps
(rear)
13809-13853 = Lamps (license & pillar) & horn
14197-14689 = Wiring
15000-15858 = Miscellaneous accessories
16000-16550 = Front fender
16600-16999 = Hood
17005-17125 = Tools
17248-17383 = Speedometer & tachometer
17402-17666 = Windshield
wiper & washer
17700-17730 = Mirror
17736-17999 = Bumper
18000-18125 = Shock absorber
18148-18249 = Comfort-Convenience Accessories
18250-18699 = Heater
18800 = Radio & Antenna
18900 = Speakers
and radio accessories
19000 = Gasoline
19100 = Fire Extinguishers
19500-19585 = Custom Accessories; Appearance and maintenance materials
19600-19980 = Air Conditioner
Misc
The sufex RM= Remanufactured
http://www.shotimes.com/SHO2fordpartsdecode.html
http://performanceunlimited.com/documents/fordpartnumbers.html