I did Ras boards... took a bit of work.
I trimmed the lower body panels to be sucked in around the boards even further. Notched them to pull them in another 1/2 inch then riveted them back to the hoops. I also had to trim 1-1.5 inches off the stock skid plate, so that told me how much I was able to narrow it up. It was basically the same as stock in the front to a solid 1.5 inches cut off at the rear where it meets up with the running boards. Made a pretty solid difference. I should have measured, but I'm sure it's pretty close to what WYOBOY is saying.
I will say there is NO flex in these boards and they are a dream on snow evacuation.