I am looking for an original vanity set for my 57 brougham
The best thing to do is to either contact any or all of the Brougham members of the CLC. They might have leads. The other suggestion is to check eBay each and every day and have the funds available "right then" to bid for the items. From what I have heard from one owner, you might expect to pay about five figures for the whole set, if not more. And he intimated that some items are simply not available at any price.
(I just spoke to my friend, and he said that everything is available, but "at a price." The repro guy for the box has a 2-3 year waiting list. So, good luck and perhaps don't let your wife/companion know what you're thinking of doing.)