Fiberglass boats require the SPORT MODEL clamp. Look at the eye on the bow of your boat. Click the EXACT eye you have on your boat. Boats that have a mounting plate above the U bolt require the LGEN2 MODEL. Boats that have a thick aluminum eye require the Model T below. Eye MUST be Exact same as shown. Boats that have a standard U bolt with NO THICK mounting plate above it require the SPORT MODEL clamp.