There are 18 choices

• Air Bag
  • (on transmission tunnel)
    • roof air bags (opt ASF)
      • Crew Cab
      • Extended Cab (4 door)
        • convenience opt YC0
        • convenience opt YC1
          • rear folding seat (opt AJ2)
          • Without rear folding seat
        • convenience opt YC3
      • Regular Cab
    • Without roof air bags
      • Crew Cab
      • Extended Cab (4 door)
        • ID 12229340
        • ID 12246595
      • Regular Cab
• Body Control (BCM)
  • (Passenger Side kick panel)
    • keyless entry (opt AU0)
      • ID 21997788
      • ID 89046980 (service replacement part)
    • Without keyless entry
      • automatic headlamp control (opt T82)
        • ID 15126384
        • ID 21997787
        • ID 89046980 (service replacement part)
      • Without automatic headlamp control
• Communication
  • (OnStar, opt UE1)
    • (Passenger Side dash)
• Transfer Case
  • (below left hand front seat)