1abackshell amphenol (cage 77820) part number 7-620909-51 or liton (cage code 55561) part number A97857rv-28-51are prefered, or amp part nuber 91-620909-51 or 92-620909-51 or litton part numbers A97857rv-28-51-T29 or A97857rv-28-51-T89are optional; 1 ea compression ring litton part number 47267-28 or amp part number 10-564869-28; 1 ea o ring litton part number 27411 or amp partnumber 10-101379-281,