Don't know exactly how you went about it after many years I finally figured how to do at least acceptable welding with my mig welder. Amazing what you can fix on sheet metal with the darn thing.

Repaired the support.  Plenty of original metal left for being 63 years old. 

Has anyone found a source for the 55 bird radiator source or should I pull it, bring it to a welding shop and have it rebuilt.  The sides are perfect, its the bottom section that is rusted up.