For your missing codes, I think/I dunno some of them
A74 - LS Package (A75 was Mirada CMX package)
C17 - I dunno at all
G03 - I dunno but glass/mirrors related
G52 - Chrome Manual LH mirror
G63 - I dunno but again glass/mirrors related
X09937 - I think order number or something related to "sales"
M5M6 Seat color and fabric (i used to have all these -- will look)
2C3 - 2 built in Canada, C for Chrysler brand, 3 for passenger car, B for manual seat belts, J for Mirada/Cordoba, 6 for Special Price class, 2 for 2 Dr HT Special for J bodies, K for 318 2bbl, 3 is VIN Check Digit, B for 1981, and R is for Build Plant Windsor CA
i have NEVER seen one with factory sun/moonroof. Nice car. Good luck in any event.