This procurement involves a specific part (NSN 7R-1660-016884617-QE, quantity 24) that requires engineering source approval from the design control activity to maintain quality, with delivery FOB origin. Only previously approved sources have been solicited due to unique design capability and data rights that are not economically available to the government. Alternate sources must qualify through government-approved procedures, but the approval timeline is too long to delay award. Unapproved offerors must submit detailed source approval information per the NAVSUP WSS brochures, or their proposals will not be considered. The government intends to solicit and negotiate with only one source under FAR 6.302-1, but will consider all proposals received within the specified period.