My parts book shows 809433 as the part number for all 1952 & 1953 Aeros, apparently superceding number 803105 from the preliminary parts book. 809433 never gets superceded in the 1954 and 1955 parts book supplements, so the same tank was used throughout the entire 1952-1955 run, except for some very early cars. Find one in any junker, bring it to a radiator shop to boil it out and reseal it and you're all set.