I built them to fit any cat. The uprights can be slid in and out To achieve the perfect tunnel width. After building them I was messing around before paint and figured shoot they would work for a V bottom boat as well if the uprights were put on oppsing sides and the 4X4 placed on the inside of the angle iron. I have yet to test them yet. Only thing I wish I would have done is put bigger casters on them. They are 3” and rated to 1000lbs - bigger casters never hurt