A couple of guys on another forum who installed one a couple of years ago told me they had to pull one side's exhaust off to get it into the right position. They also said that it takes a little force to lever it into the correct position.
Those comments below:
"okay, I remember now ... you'll have to losen the exhaust so you can finagle things around. It's a TIGHT fit, will take some OOMPH to get all the bolt holes to line up. Use of a screw driver for leverage is handy.
Look at the bike, it'll be pretty obvious where the mount has to go and what bolts you'll have to remove in the process. I do know we loosened or removed the exhaust on one side to get this to work, probably the left side but not sure now. I think we also loosed or removed the shifter peg and maybe even the foot rests. Mainly just so you had access to things. If you have a digital camera, take a couple pics of the left and right side of your bike and post them, that should trigger my memory more."
"Ah yes, I remember this hateful thing now. We took the pipe out so we could get at the right side bolts. It's murder. Actually, it wasn't terrible until we tried to get the pipe back on. Make sure you understand how the clampy thing at the end of the pipe (where it meets the cylinder) works, or better yet don't dismantle it from the pipe and you'll be ok. That's what threw us for a loop, was getting the clampy thing back on the pipe to reattach. You shouldn't have to force it at all, just slide the bigger half down and attach the smaller one (I think).
I seem to recall that the bottom bits attach to the footpeg mount bolts or somesuch. Look it over carefully before hand and don't shoot yourself in the foot and you should avoid the "two monkeys with wrenches" effect that we had."
Sounds promising, doesn't it? Hopefully hgree can get us those instructions. BigT who just checked in here for the first time yesterday or the day before said he was looking at one on ebay, so if he gets it there is another possible source.