Fender Tag code confusion

[69&75_Darts]

1. I am having trouble decoding the third line with the 15 and 29. The material I have references them as "unknown molding." I type it out and I have a photo with the codes in question circled.
2. 
   
3. abcdefghjkmnpursuwy
   64 74
   ABCDEFGHJKLMNPQRSTVWXYZ
4. 1 11 16
   12345678 AX TRM PNT UBS
   59 2 P6X AA1 B8
   LP23 31 5 *** *** XXXXX
5. 
   
6. Any help would be great.

 

[YY1]

1-5
2-9

Isn't that the engine and trans?
Not sure I'e seen a 9

Try the 66/67 Charger tag decoder