72 Dart, mini tub, narrow rear, spring relocation
or go to an online metal shop and buy the through tubes. They will cut them to a length and you'll need to clean them up.
http://www.speedymetals.com/pc-3494-8242-1-od-x-065-wall-dom-steel-tube.aspx
That place will ship it via USPS as well if you call them.
You can buy larger OD tube as long as the ID is in the .875 range.
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