NO problem if the bushings are the same size and it fits, a 1/2 is not going to make a noticable differance. The original rev chassis had longer shocks than the 06- version, only to lower the front end for better cornering, but used all the same components (a-arms). Your geometry will not change as it is controlled by the a-arms, not the shocks. What is important is that the shock travel is the same, so it won't bottom before it is supposed to.
