a housing being mountable to {HEAD ~ a floor} of {TAIL ~ said vehicle} and located on opposite sides of said floor opening 
of
a housing being mountable to { HEAD ~ a floor } of { TAIL ~ said vehicle } and located on opposite sides of said floor opening
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH