I think you'll find that the 66 corral does not have the 'north' and 'south' legs that are present on the 65
BTW, I have an uncle in Mississippi that claims he worked on the assembly line making service replacements for the horse/corral/door handles/emblems, etc...he said there's absolutely no telling how many tons of those parts they'd melted down or simply thrown in the trash over the years. He had a few parts he had saved...all for 65-66
SamG