just dis one
I had one made at TAPCO plastics. $32 for having them duplicate the one I took off. I then cleaned off all the old caulk. Taped the edges to keep the new caulk off of the fiberglass. After I laid down several beads of caulk I spread the caulk against the cabin. I then placed 4 pieces of welding rod into the screw holes it was easier to align the port directly in to position I then replaced the screws be sure to tighten enough to get good contact with the caulk but not so tight to squeeze to much of the caulk you need to bed the window well I then ran a bead around the out side and smoothed it and then removed the tape to leave a nice straight edge