Can you change vent and filler tube

I installed the 1969 filler neck with vent today. I also installed the 1968-1970 18-gallon gas tank, and it was a real pain to get it all aligned and fitting to seal correctly in the trunk floor seal. I installed the filler tube and the seal on floor first then put the tank in. That was the easiest way to get everything to line up and fit. Also, I looked at my old trunk floor seal and if you look the seal pushes into the floor this is how it seals, I was thinking the seal flange stuck out into the trunk area and it wouldn't make the angle to seal the filler tube It took a little trial and error, but it all worked out and all fit. I used a 1970 fuel cap which fit perfectly with the 1969 fuel filler tube being mounted from the inside.

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