This opportunity is for the procurement of two units of a specific part (NSN 1R-9999-LLF02N446-SX) with delivery FOB Origin. The item is flight critical, requiring government source approval prior to award, and the government intends to solicit and negotiate with only one source under FAR 6.302-1. Prospective bidders who are not already approved sources must submit all required data from the NAVSUP WSS Source Approval Brochure with their proposal, or their offer will not be considered. All proposals must be received within 45 days of this notice's publication to be considered by the government. No specific budget amount or location for performance of services is specified.