I am trying to identify what type of plane my two recently acquired drop tanks came from. They measure 23" in diameter and about 12' long. Made of aluminum and "ALCOA" appears in raised letters on the rear end. Come apart into three pieces sealed by large o-ring style gaskets and have a metal rod that goes directly through the center of the three sections that screws together to hold the 3 sections together.
I looked all over the web as best I could and can't find anything that matches. Have two metal attachment points. No fins. Front more blunted. Rear more angular with small (5") removable tail cone that allows access to the main nut that allows the three sections to be separated (or mated and held snug). Fuel filler in front of attachment points. Very simple internal plumbing consisting of a fuel filter and a two short pieces of stainless tubing.
I believe they are at least 30 years old based on the story of the man I got them from.
I have embedded one picture of the tank, but there are more pictures available on the Ebay listing.