229 and 229RH are a sided pair, one going on one side and the other on opposite side. The side that they fit on will depend on the vehicle that they are being mounted on. A bracket being listed as RH does not mean it is always on right side. Sometimes we find that a bracket that was originally designed for right side of a vehicle may work great on left side of a different vehicle. For example 2004-2014 Ford F-150 used 184RH installation kit for driver side and 184 kit for passenger side.