Here is pictures of my solution to the lack of availability of 76
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early 77 gas tanks/senders. A trunk floor from a 86 Fifth. has just about the same dimensions with a few extra pieces added inside (easy to remove) a pic of the comparison with the wagon floor intact, the fifth out to ck. final measurements. the old cut out and the new welded in ready for paint.
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Replacing early77/76 trunk floor in wag. to use later size gas tank