Will also fit Outlaw 4 and Outlaw 5 chassis when using wide front end spacing. 3mm thick carbon x-shim for under front of XHB or Outlaw 5 front suspension mounts. Raise up the front suspension mounts for more consistent steering on high bite tracks where you are lowering the car down real low or to give the car a more stable feeling in general. Thru holes are drilled for M3 Screws.