E-Bay is your friend. I replaced my OEM turn signals with aftermarket that looked nearly identical. Otherwise, they sell alternates. Sorry, can't help with the rest.
The OEM Service Manual is available from the Home Page of this site. Check there for the PDF download for your bike. Cheers!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII