Fitted the fiberglass tips to the right elevator. I was very confused as my initial efforts didn't come close to fitting. I realized eventually that a considerable amount of the flange at the bottom had to be trimmed off. You can see from the pictures that about 1/4" had to be trimmed away. Once that was finished, it fit reasonably well.
I cut two 1/2" strips from the trim kit to fit inside the tip and take the strain of the pop rivets. I will epoxy them in place.