Hi VoteForDavid,
Yes, I am looking to identify appropriate keycaps for my Truly Ergonomic 207 which I can add markings on to match my layout.
To make things clearer, here are the keys (highligted) that I need to replace with my own layout:

So as I see it I need to identify the following:
1) Are the keys on the Truly Ergonomic "normal" cherry OEM keycaps?
2) If so, what positions and sizes on the
cherry range match the keys that I want to replace?
3) As a bonus if anyone can help me identify the font used on the Original keyboard better than "like Tahoma" that would be awesome.
4) As a further bonus, any ideas on sticking / printing something on the front of the keys then that would be awesome.
5) Final uber bonus, anyone able to think how to do replacing the "Del" and "Tab" keys with the new ones would be amazing - (I was vaguely wondering about 3D printing them or scraping the existing marking off and replacing them).