first and second end caps formed with tangs providing an interference fit with the walls of said central groove of said channel to secure said first and second end caps to {HEAD ~ said first and said second ends} of {TAIL ~ said channel}, respectively 
of
first and second end caps formed with tangs providing an interference fit with the walls of said central groove of said channel to secure said first and second end caps to { HEAD ~ said first and said second ends } of { TAIL ~ said channel } , respectively
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 OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH