The contoured body cross section is commensurate with {HEAD ~ the contoured wall cross section} for inserting and keying {TAIL ~ the housing} into the receptacle 
The contoured body cross section is commensurate with { HEAD ~ the contoured wall cross section } for inserting and keying { TAIL ~ the housing } into the receptacle
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH