Here are all the codes , decoded .
N76 = coolant recovery system
R35 = AM/FM-MX-Stereo 10 watt
V5X = Body Side Protective Moulding with Vinyl Insert (black)
26 = 26" diameter Radiator
L2 = built on line #2
J54 = Sport Hood
L31 = Turn signal Light , Fender
M21 = Drip Trough Moldings
M26 = Wheel Lip Moldings
N41 = Dual Exhaust System
N42 = Bright Exhaust Tips
EW1 = Eggshell White ( Chrysler part # AY69EW1)
U = Built to specifications For : USA Order
B41= Front Disc Brakes Power / Rear Drum
C56 = Bucket Seats
G11 =Tinted Glass All Windows
G54 = Left Hand Out Side Mirror Remote Chrome Racing
EW1 = Eggshell White ( Chrysler part # AY69EW1)
A6X9 : A = A class , 6 = Vinyl Bucket , X9 = Black
000 = Full Door Panels
C05 = Wednesday , December 5th / 1973(Scheduled Production Date)
239278 = Vehicle Order Number
E58 = 8 cylinder 360 , 1-4bbl HP 245hp
D34 = 727 Standard Duty Transmission
J = Challenger (car line)
H = High ( price class)
23 = 2 Door Hardtop (body type)
L = 360 1-4bbl HP 8 cylinder - E58
4 = 1974 (model year)
B = Hamtramck , Michigan (assembly plant)
262526 = Sequence Number
Doug Lepak
"The Steering Wheel Guy"
http://drive.to/stwheels