Although mounted separately, intervening structure can be provided between the retractor and {HEAD ~ belt guide}, such as {TAIL ~ a sheath} covering the belt 
such as
Although mounted separately , intervening structure can be provided between the retractor and { HEAD ~ belt guide } , such as { TAIL ~ a sheath } covering the belt
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH