The horizontal column location is critical for correctly decoding the numbers. There are 7 items possible with the first item listed directly below the first letter of the transmission code, or column number 15 and the column number is how they will be designated below.

C-15 (G) ~ Power Steering Option Code:
  1 = Power steering [RPO N40]

C-16 (H) ~ Power Brake Option Code:
  1 = Power brakes [RPO J50]

C-17 (I) ~ Radio Option Code:
  3 = Radio [RPO U63 or U69 or U79]

C-18 (J) ~ Disc Brake Option Code:
  3 = Disc brakes [RPO J52]

C-19 (K) ~ Air Conditioning Option Code:
  1 = Four-Season Air Conditioning [RPO C60]
  3 = Comfortron [RPO C75]

C-20 (L) ~ Power Window Equipment Option Code:
  3 = Power windows [RPO A31]

C-21 (M) ~ Power Seat Equipment Option Code:
  3 = Four-way seats [RPO A41]