Joe, I started a major remodel of a brand new corbin seat last night I`m not sure what your brackets look like,nor how big,but the black seat pan on the corbins is pretty thick even at the edges.You can probably use a Dremmel to grind or slot the seat sides without getting into the vinyl,and it should just drape back down over the brackets.Wear a dust mask,as that stuff nasty,and goggles and a longsleeve shirt.Dont sweat the modding,and you`ll be the only corbin/Triumph racked bonnie on your block.