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Whoever is bidding on this to win is likely bidding for more than just the lid. If you wanted to be creative you could remove the two top bridges with the tubes intact. Those particular spotwelds never were that strong and they twist right off with little effort and no damage. A little trickier may be to remove the 4 rounded tabs the same way. Then take a Snobar base in which those items are inaccurate, do the same, re-spotweld with these and 'viola', something that could pass for a real A12 base.