There are 6 choices

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classic style (creased door skin)
- 6.0L (VIN U, 8th digit, opt LQ4)
  - CNG
  - gasoline
- 6.6L (VIN D, 8th digit, opt LBZ)
- 8.1L (VIN G, 8th digit, opt L18)
new style (smooth door skin)
- 6.0L (VIN K, 8th digit, opt LY6)
- 6.6L (VIN 6, 8th digit, opt LMM)

Engine Assembly for 2007 GMC Sierra 3500 HD

Fits: classic style creased door skin 6.0L VIN U, 8th digit, opt LQ4 CNG (change)

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