a bearing seal for sealing the bearing assembly from {HEAD ~ an exterior side} of {TAIL ~ the wheel half}, and 
a bearing seal for sealing the bearing assembly from { HEAD ~ an exterior side } of { TAIL ~ the wheel half } , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH