The 51-56 tanks were reproduced. Auto City Classics
https://www.autocityclassic.com/packard-gas-tanks/ may still have them and if so, the cost of a repro might be worth considering or at least comparing to the cost of having yours reworked.
If yours needs more than a "boiling out" which could be done at most local radiator shops then a repro will definitely be less expensive than the Renu process. That process is currently the only option for cars older than 51 and if the repros are all gone then that will be your best option too.
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