You can also check on e-Bay, and your local motorcycle junkyards. Shops can likely order one for you, as well, but your best bet will be the first two suggestions. You can try JC Whitney, but it may not be listed under your bike model; try paging through one of their print catalogs -- check the Gold Wing section, first. I found one, in the past few years, that looked the same as my black, plastic stick (thread size looked the same). Cheers!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII