I took a chance and ordered some Gotoh tuner buttons, FR18I.
The fit the Phase III tuners of my P22 perfectly!

Here's the before and after, so for you guys looking for ebony, RW replacements,
look no further than these Gotoh's (the Ebay store I ordered from is here,
reasonably fast shipping, at least it arrived the day before my clinic tour, so I couldn't be happier).
Here's the actual item I bought for reference: http://cgi.ebay.com/ws/eBayISAPI.dll...m=370520898266