A first flange extends perpendicularly from the first side of the upper surface of the longitudinal plate and an end wall extends perpendicularly from each one of {HEAD ~ two ends} of {TAIL ~ the bottom surface} 
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A first flange extends perpendicularly from the first side of the upper surface of the longitudinal plate and an end wall extends perpendicularly from each one of { HEAD ~ two ends } of { TAIL ~ the bottom surface }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL