Dave:
If you have a bench grinder, you can do this:
Take out the existing bolt and grind the hex off down to the shoulder. This should leave thin head that will look like a carriage bolt. Install it from the inside and use a 8mm acorn nut to fasten it. If you do not have an acorn nut handy, there are two on each of the rear muffler hangers. Remove one from each side; you can replace it later when you get some.
My bike is an I/S, but I think all those parts are the same on the tourer.
