Xtracycle RFA Assembly Manual page 46

Install the RFA FootRests
46
Pick the RFA FootRest that corresponds to the side
of the bike you are installing it on first. The flat plate
is installed on the bike frame towards the front of
the bike and the clamping ring is installed around
the UtilityRack toward the rear of the bike.
rear
mounting
clamp
Left FootRest
front
mounting
plate