The stew-mac #0196 ferrules have no rim (lip) around the top of the ferrule and are advertised as "#0196 is for vintage-style flush-fit installation". They just mount flush with the body with no countersink because they are rimless. While searching on google for pics of 50's telecasters, I saw many examples where both types of ferrules were used. Whether or not they were the original ferrules, I do not know.
Not trying to start any controversy here, but if I am completely off base, I bow out to those with more experience. Just as a lark, I emailed fender to ask the source. Will pass on their response if and when I get one. And again, If I am completely wrong, I sincerely apologize.