If you're restoring a K0 back to factory spec here's a link to a post I put up on the sandcast forum about where to source and how to fettle hoses.
http://cb750sandcastonly.com/smf_forum/index.php?topic=1521.0You will have to sign up to the sandcast site to be able to view the images though.
Regards, TC10 (Winner first BOTM for the forum in 2006 with a very
non-standard 1969 model)