This notice is for a sole-source acquisition of one unit of a flight-critical item, with delivery FOB origin. Only sources previously approved by the Government for this item have been solicited, and award cannot be delayed pending approval of a new source. Offerors that are not approved sources must submit the required source approval information from the NAVSUP WSS brochure, and those failing to provide all required data will not be considered. The Government intends to negotiate with only one source under FAR 6.302-1 but will consider responses from all responsible sources expressing interest and capability. No budget amount or performance location is specified.