These are the uprights that are included as standard parts for item 84262 F104W GP Edition. These uprights allow the user to two settings the axle shaft position and the trail position can be changed. These adjustments enable fine adjustments to match track conditions. Left and right uprights are asymmetric, so more settings are possible by switching the left and right uprights or installing spacers. In addition, each upright has 3 steering rod attachment positions to change steering response. The included spacers allow ground clearance adjustment as well.
