Regardless of your Trailer Brand, these Galvanized Roller Brackets will outfit any trailers crossmembers. Boat Trailer Roller Brackets are designed to mount Keel Rollers along the center line of the boats hull. Pick out the size Galvanized Keel Roller Bracket you need and get that boat trailer back in action. You will noticed that these brackets have slotted adjustable holes. You would use either 1/2 inch Bolts or U-Bolts, available on our website, to mount these brackets to your boat trailers cross members. It would be ideal for you to know the dimension of your trailers cross-members before ordering your U-Bolts, to ensure a proper fit.