I will third Dens71 tower clamp comment. I dropped two original tank out of two 71 V.N. cars and they both had these tiny tower clamps on the lines going into the tank only.
TAric, I did have the original exhaust pipes on my 71 TA and they did have that flattened area you are referring to.
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1968 Firebird 400HO convertible
1971 Trans Am 4-speed, white/blue
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