I have a 2005 1000rr and I need new wheels and tires. I know The front wheel on th 08 will bolt up with spacers on the calipers but the big question is will the 08 rear wheel work?
04-07 rear wheels are 5.5" and the 08 is 6" and same size tires.

Does anyone know if this works with the right spacers?

 

you can "make" anything to work. but the answer is no. the wheels are two different sizes, so they are not designed to be interchangeable.