H3nav - for what it's worth, I just thought I'd pass along a recent find. Earlier in another thread we talked a little about the older style 200's with the screw on bottle cap. I found that a couple of my older "new style" caps with the plug-in tube on the top appeared to be two-piece at that point. Sure enough, the very top portion with the tube unscrewed from the rest of the cap, and the threads internal on the cap matched the threads on my older Badger 200, so it will work.
I know you've got your older 200 stripped for parts, but if you wanted to put it together again for old times sake, or another single action airbrush, you might be able to get a bottle cap for it this way.