The reflector comprises {HEAD ~ an elongated, notched, thermoplastic channel} like {TAIL ~ reflector} having internal and external channel surfaces 
The reflector comprises { HEAD ~ an elongated , notched , thermoplastic channel } like { TAIL ~ reflector } having internal and external channel surfaces
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH