This photo shows the general differences in the Hawk, Collect-Aire, Battle Axe, and Tamiya 1/48th Scale Thunderjet kit auxiliary wing tank parts.
Top to bottom are Hawk, Collect-Aire, Battle Axe, and Tamiya parts. The first three elected to split the tanks at the horizonal (longitudinal) center line; Tamiya split the tanks at the vertical (longitudinal) center line, so it looks more fat than Hawk or Battle Axe. The Collect-Aire part is too large in diameter, and the integrally cast fin is too large and shaped incorrectly. Hawk does not have the F-84G seam cover, the others have it; this is most likely because it appears the Hawk part is correctly sized for the earlier, non-finned 185 gallon tanks which did not have the seam fairing. The Hawk and Collect-Aire parts do not have a separate landing light, the others do. Generally, all details of the tanks considered, only the Tamiya part is correct for the 230 gallon tank used on later Thunderjets.