Look to see if you have mounting plates already installed. On the 330's I have seen them just on the outside of the rear hardtop leg. If you do have the mounting plates installed then call grady and see what bases they are for and or what was installed at the factory. probably Taco, which was the case with my boat. If you don't have the mounting plates, then you will have other choices. I have had both the side mounted Lee jr's and currently the hard top mounted. The hardtop mounted are more user friendly. They telescope down if you need clearance and or to put them and store them at the end of the season. They weigh next to nothing compares to the old lee poles. They are also up top and out of the way so you don't have to work around them going to the bow.