Ask me next week when mine comes. It measures out so it should fit. Went on the website and got drawings. It's a real shame that RV's can get away with the s**t they do. There is NO house in the United States that would allow a 9" plus riser if there was any inspection going on. We travel with a 96 year old gentleman that seems to need the potty often and those steps are hard. Wish I had known sooner. I made a new step inside the camper so we don't have just one step in 21". That was hard on us and we now have storage beneath the risers.