Lets try the photos: Photo 1, held onto the frame by 2x3" "U" bolts, yours will be bigger. Photo 2, mine are the 2 x 9" rollers with 1/2" rod, there are press fit washers top and bottom so the rod can't come out. The rubber rollers actually roll so there's no scrapping the boat. I would guess yours may have to be double height..bigger boat. Have mig welder, make projects. Any questions, let me know, cheers.