Im not looking for spacer info but your post was pretty informative and i wanted to say thanks fir writing and posting. it was a good messageI ran a pair of wheel spacers for a few trips with my lift kit to eliminate rub cause by the lift. I've considered running my 1" pair on the fronts of my machine so my front/rear are the same width, currently I'm 2" wider rear than front. (50"Fx52"R)
It depends on the machine you have which effects CoG (center of gravity) the older style cats 04 and older had a high CoG because the fuel tank was mounted up high which moved weight up, the newer style 05+ have the tank mounted rear under the seat which lowers CoG. I have an older style machine 04-400 FIS so this is the view my comments are from.
Sorry this is a rambling post that might not make sense.