There are 12 choices

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Air Bag
- (below left hand front seat)
  - Crew Cab
  - Extended Cab (4 door)
  - Regular Cab
    - ID 12220290
    - ID 12231770
    - ID 12239399
Body Control (BCM)
- (under steering column)
  - Crew Cab
  - Excluding Crew Cab
Communication
- telematics (OnStar, opt UE1)
  - (Passenger Side dash)
Cruise Control
- (left hand firewall)
  - (4.3L)
Memory
- (under Driver Side seat)
Steering
- (Quadrasteer, opt NYS)
  - (left hand rear frame)
Transfer Case
- (left hand dash)

Chassis Computer for 2003 GMC Sierra 1500

Fits: Air Bag below left hand front seat Regular Cab ID 12239399 (change)

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