Ok, i got it... hope this helps... heres what i did...
1. downloaded the ringtone to my mac...
2. double clicked it, and its on itunes now...
3. right click it and click create ACC version

4. it created another file...

5. then i right clicked the new file.. (the first one) and select "Show In Finder"

6. changed the extension from .m4a to .m4r (click Use .m4r)

7. after that... i copied the ".m4r" to my desktop then i deleted the TWO files from iTunes...
8. double click the one on my desktop... and Wallaaaa... is on "TONES" =D