If you have a Rx1/vmax xt/venture/rage/worrior, your sleds shocks and side arms do not have bearings in them. For the rage and worrior,buy the arms from below and remove the bearings and seals. You will need to ream out the side arm ends about 1mm to accept the bearings and seals. For all others you can just buy a used set from a viper/sx/srx/xtc and install them.