This video has been out for a while but I thought I would share it in case new owners have not seen this. Video and idea is by Gurumods on RCGroups and Youtube, so thanks Guru. You use the existing rear crash bar. It will save the fender but an inherit problem with this design is the crash bar wire bends, so try not to slam the wheelies ok lol.
Note: Another tip for adding strength to the fender is to apply shoe goop underneath the fender near where the fender and seat come together. The wheel bar can be found on ebay at http://www.ebay.com/itm/Traxxas-1-16-E-Revo-VXL-Hopper-Wheelie-Bar-IMPROVED-/270458379407?pt=Radio_Control_Parts_Accessories&hash=item3ef8935c8f