GMC Logo2007 GMC Sierra 2500HD III (GMT900) Extended Cab Standard Box: Side view of extended cab pickup with standard bed and dual rear doors

Side view of extended cab pickup with standard bed and dual rear doors

White extended cab pickup with four doors and standard-length cargo bed, showing detailed wheels, side mirror, and rear tailgate with Z71 badge.

View Dimensions of the 2007 GMC Sierra 2500HD III (GMT900) Extended Cab Standard Box

View 38 images of the 2007 GMC Sierra 2500HD III (GMT900) Extended Cab Standard Box

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