New member, first post. So I've been dying to update the XR's suspension, my swingarms arrived today-2003 CRF450 & 2005 CRF 250. Both swing arms fit in between the frame rails on the Xr with a 1/4" side to side gap. Both arms appear to be identical with the only differences being cosmetic. I will get the calipers out & confirm this. I had found 1 thread on this topic where the guy said it wouldn't fit without machining although he did not elaborate further. I wanted to get this info out stat incase there's other looking to do similar mods. The linkage should be here in the next few days as well as the shock so I'll update as progress continues &'post pictures as well.