Or if you have a buddy with a lathe, you can spin you up a set
for next to nothing. Here's a batch I made up from 3/8" SS and
made the brass nuts from some 9/16" brass hex stock, both of
which I dug out of the scrap bin. Cheaper than running round
the country burning up petrol looking for the right fasteners.
http://www.pbase.com/dennygraham/image/136491783DG