A body door lock ferrules

I bought some generic metal ones at the parts store. They sold them in the "help" section. I also bought the lock knobs there. I had to buy two packages of the knobs though, as they had two styles of knobs in one package (one had a hex shaped top - Ford style). I used them on my '68 B'cuda. I also installed the ferrules from the top. I have a 'hook' tool that I stuck in the hole and bent the tabs, no need to go underneath.
Dallas