iStep 5 Inch Running Boards 2004-2006 Toyota Tundra Double Cab (Black). 5-Inch iStep Running Boards by APS®, 1 Pair. The iStep provides an exceptional appearance enhancement for your vehicle. The innovative patented design, designed after the popular smartphone, gives your 2004-2006 Toyota Tundra that unique look and functionality that car enthusiasts are looking for. Secured with a full length non-slip pad, the iStep iStep 5 Inch Running Boards 2004-2006 Toyota Tundra Double Cab (Black) provides a level of quality you can trust. These solid, one piece iSteps are the ideal side steps for your vehicle.