how do I identify correct A body gas tank?

kiss said

Can you give us a little more info? Do you have the filler neck? Do you just need a gas tank? Are you wanting to keep it factory correct?

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Thanks, all. I'm trying to put a basket case back together. The old rusty tank I have for mock up is an unknown piece(2 strap) that mounts correctly in the car. One fit up problem is the new trunk floor does not have the filler tube hole quite in the right place. Plus having a new quarter panel and a known correct filler tube, my main concern is identifying what tank I have before we start modifying things to fit. Mostly to affirm filler tube inlet position. Victor