I have a set of 450R shocks on my 250R. They bolt up no problem as others have stated. They are too long as well, that being said..... Mine were a great improvement over the blown out stockers that I took off. The shocks I bought were re-valved and set up for a 240lb rider. Seeing how the 450 is heavier than the 250 it worked out great for me as I am 280. The only complaint I have is the stance of the bike. It sits up high in the front when it's sitting. Thanks Loren