The placement of the mounting strips and {HEAD ~ tubes} in {TAIL ~ the housing} can be selected as desired 
The placement of the mounting strips and { HEAD ~ tubes } in { TAIL ~ the housing } can be selected as desired
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH