Can you take it (side case, internal gears or what ever, battery, etc......) directly off a XL and install on a XR? If so would 15 lbs be close to the weight gain? Are there after market companies that make them for XR ? Edited ......... search was not working when I posted and it is now. That ? has been asked many times before I see. Seems like an expensive job to put L parts on a R.