Fender Tag Decode; 1970 Duster

Looking at purchasing this 1970 Duster and I am trying to decode the fender tag. I have about 505 of the codes figured out. I can't make out the first 3 digit code other than ?21. Can anyone tell me what "Y05", "LGXW", and "VL29"mean? (I know the "V" is Valiant and "29" is 2 door sports coupe; what is "L"). Many thanks to whoever has this information.