Small update. Still no luck in tracking these down, but I did try a tip from an eBay seller in the UK. I recently purchased some TnA engines from him and almost all of the terminals were in like new condition. I asked if he had a source for them and he said he just cleans them. Basically using distilled white vinegar applied for about 5 min, then rinse with distilled water. I am shocked at the results. Some of them are not even noticeable that they had corrosion. That said some have issues and some well, they were too far gone. I have gotten pretty good at setting the terminals in place with a new brass rivet so I usually will drill the old one and then clean and replace with a new rivet.
Not sure what to use to make them shine again for the ones that are in worse shape, but maybe just some polish?
Also side note.. There is a positive and a negative that are different widths for these. Positive is the narrow and negative is the wider one.
