Not sure which 2003 GMC Sierra Side Mount Toolboxes are right for you? We have over 55 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"I like it because I can put dirtbikes, a snowmobile, a camper shell, whatever in or on the truck still. My only gripe is the black box came with plain aluminum colored mounting brackets that mount to the outside of the box." —Justin A from Chico, CA bought a Dee Zee Specialty Series Wheel Well Truck Toolbox for a 2003 GMC Sierra.