I did not take any of the bottom when these are laid out. What is it you are looking to see? The underside is not as smooth as the top, probably slightly better than the OEM fenders which have a lot of marks from the molds. If you are looking to see if they have the boxes for the brackets, they do not which is why I am making new brackets. There will be two stainless button head bolts (included) visible on the top surface of the rear fenders. The fronts will also have 2 visible. In order to not have 4 in a rectangular pattern yet have enough support, the fronts will have additional material to have another mount underneath.