Spoke to Lonestar today, figured I would add what I found out in case anyone ever needs info in the future. I misunderstood the 1/8" part, there is only a 1/8" difference between the recommended lengths of shock for each swingarm. Basically, on both swingarms, the lower shock mount is at the bottom of the swingarm, but the DC4 is a little lower. The DC2 lower mount is closer to the axle, while the DC4 mount is closer to the frame. The DC4 was designed to be used on hybrids, where more airbox clearance was needed. I still went with the DC4, since I was told to use it by a suspension guy I trust and figure a more upright shock is always a good thing.