Purchased for 2016 Chevy 2500 WT. The first problem is that they won't fit on a truck equipped with a factory wash system. A rail kit that mounts under the truck prevents them from being installed. I wanted to install them anyway, so I cut slots in the earbuds to fit. Secondly, it is very difficult to align the screws. I installed them on a cold day so they weren't very flexible - maybe that was part of the problem. Eventually mine came with three installation kits, all with the same parts. Unfortunately, the mounting screws did not fit the factory "nuts". So I had to invent my own screws.