This is a sole-source acquisition of 17 units of a flight-critical part, with delivery FOB Origin. The item requires Government source approval, and only previously approved sources have been solicited. Any alternate source must qualify under Government-approved procedures and submit the detailed source approval information required by the NAVSUP WSS brochures. Offers lacking the required source approval data will not be considered for award. The Government intends to negotiate with only one source under FAR 6.302-1, but interested parties may identify their capability.