I put gators on my '79, which wasn't designed for them. I just measured the OD of the upper, and lower tubes, then found some that were close, on a dirt bike supply store. When they came in, I secured them with black zip-tie's, one on each end. Worked perfectly. There are many suppliers of gators, on the Web. Google is your friend, and so is a
caliper to measure the OD's needed (I use mine fairly often, very useful tool to have lying around). Cheers!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII