I retrieved this from my horde of Service Counselors.
It documents the change in gas tanks and shows the "notch" which is
VERY small. Since the "notch" only shows up sporadically in 51-56 I wonder if they were using up filler pipes which had already been manufactured? They obviously dropped the notch, but didn't want to discard parts already formed and for which they had time invested. Note that this notch is
very much smaller than the notches on the new tanks.
You can click on this picture and blow it up to get a good view of the notch.
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