I don't know if this helps, but this is where I'm at with parts and reproducing. Some of these models are still WIP as info comes in, but you get the idea.
Pink prophy cup polisher:
Still unidentified, but the references are great and a replica can be made with cast handle and matched cups
Black thumb-knobs and orange bottom cap:
Still unidentified, but again the references are great and it is straightforward to make modeled-printed-cast replicas.
Red Panel Indicator light:
Available on Ebay and Amazon, readily available.
Crest toothbrush cap:
Vintage toothpaste tubes are available online and are $$$$. My cap (with tube) was $40US

and I won't be doing that again, casts are easy and cheap.
Revlon clippers:
Rare but out there, if you're willing to pay a bit in some cases; these were manufactured through the late 70's and through the mid 80's. Remanufacturing is not really an option, but there are also stand-ins (including the newer Revlon versions) that are identical in size and can be a stand-in (that's a theme for a few things here). In a pinch, someone can install neodymiums in there Buddy and easily swap out clippers if/when they get the good ones.
Johnson and Johnson Vintage floss dispenser:
The correct dispenser heads (with two 'bunny-ear' cutting tabs) are usually installed in the top of J&J's rectangular coffin-style floss containers (look for dental floss or dentotape dispensers). Getting replicas of these stamped is not cost effective, but there are single-tab versions that can be used as place-setters.
Revlon nail file:
Not that uncommon, but we're usually having to buy them in manicure sets (hit me up if you have any idea what to do with the rest of these sets lol). When I pull the correct blade length from the photogrammetry I will post up a template PDF for the cut shape and length. I would love to make replicas of these as a stand-in or to make the overall cost of a BB more affordable, but for now it's easier to just hunt for a real one.
Gilette Good News disposable razor:
There are a surprising number of these out there and still available. Just be careful that you get the first generation boxy-handled razor, not the pivot head model (very similar). There is also an updated second generation razor, but it has a much sleeker design. If the correct razors dry up on the open market, I should have a few extra after my project that I'll offer to people here (correct ones and pivots).
Butler Proxabrush:
Hard to find in orange. I'm molding a NOS brush (thanks
scarf man ) and hopefully get some correct orange casts that will work.
CC Dental mirror:
CC-brand are super-hard to find, never mind getting the correct light blue color. I have seen several identical products out there without the CC-specific branding; a lot of mass-produced products from China use the same factories (and even molds) across different distributors with small tweaks. I am scanning/modeling one of these knock-off mirrors, modeling the branding onto that, and then it will get resin printed for a master to mold. Tinted casting off of that master will give a uniform-finish handle (obviously mirror gets glued in). Started revising the digital logo, still a ways to go (mirror body is a stand-in):
Toothbrush:
Sounds like it's a vintage Vistron Pro, and I have zero confidence in me getting a bunch of those

There are a lot of stand-ins available that look OK and it's fairly easy to upgrade the piece down the road, so that's good. A good replica can be made, but that's for another discussion; I want to get through all of the other hurdles before that gets revisited.
Black comb:
A lot of people are looking at the Ace models, I have also waiting on a couple of Vistron models that look promising. Although I want an original comb for my own Buddy, I'm all for casting multiples to keep the overall cost of a replica down. As you guys already know, it's not just
one item that makes the Buddy expensive to build, it's a bunch of $10 or $20 or $30 pieces that all add up. If I can get a stockpile of reproduction parts to go with my own project plans, I can make those available for people who don't want to spend hundreds (and hours) hunting.