Not so easy
Have a 2016.5 Mazda CX5 and I ordered a set of running boards for a 2016. Some holes were round that were needed to be oblong for mount brackets to fit. Had to grind them to work. Plastic underbody had to be cut around holes for other mount brackets to align. Once all this was figured out, the assembly was easy. I really like the look and they help my wife get in and out.