I think the basic design is the same. Our Ex is a short long arm front, don't know what to call the rear just yet. Si looks similar to me at a glance. Bushings, however, are not the same part for the front suspension. I bought a set of shock bushings for an Si because I could not find any for our Ex, and had to turn them on a lathe to fit them. Fortunately all were too big, too small and they would have been useless. Strange thing is I see shocks listed for an Si the others, Ex, Dx, and so on like they are all the same part. I think they went to Mac strut sometime after 2000, could be wrong about that though.