Not to rain on anybody's parade,but
oil pans do rust through.Personally have played around with cars all my adult life,it happenes especially in the Northern hemisphere with condensation and from the inside out.This corrosion on the Canton pans is what concerns me.My Cobra sat for almost 5 yrs and that was one of the first things I noticed.I wiped mine down with WD-40 just to see what I could see.It appeared to be just an anodizing issue.Thanks for the help.