2004 GMC Canyon AccessoriesView 100's of Accessories for your 2004 GMC Canyon Truck. We feature A Huge Selection of of accessories for your 2004 GMC Canyon. See performance, interior and exterior accessories from all the top brands. Upgrade your GMC Canyon Pickup and get Free Shipping a Low Price. Plus, if you need help finding the best accessory for your GMC, our product specialists are available to help you 7-days a week.