While the wheel is off check the wheel bearings, and if they are bad get some ALL-Ball brand replacements, as they are sealed and you won't ever have to grease them.
The brake cable can be found at Ronayers.com or Bikebandit.com. Check the microfiche for part numbers, but I am 99% sure they interchange from 1992 to 2007.
Is your cable broken? Do you need rear shoes? Or do they just need to be adjusted? My 1996 VS800 went something like 85,000 miles on the original rear shoes, and the ones on my 1993 have plenty of life left after 60,000 miles.