Were you looking to restore the original key-faces, or use different stick-ons, for
use with a modified keyboard character set? Single worn keys may be replaced.
Are you already in possession of the labels, or are they somewhere for sale online?
There may be comparable images of keyboards online, but their exact dimensions
may not be so readily compared. A working keyboard for an iBook G4 12" or 14"
could be found online, some in fair shape at reasonable price. Identifying correct
match may be difficult, since part numbers vary between stock & replacement.
welovemacs, powerbookmedic, wegenermedia, ifixit, and others may have parts
they do not list on their web page; some who repair Apple portables for a living
have many replacement parts & may have some to retail for DIY repairs.
Good luck! 🙂