The requirement is for 4 units of a specific NSN part, with delivery FOB origin. The item is flight-critical and requires Government source approval; only previously approved sources have been solicited, and technical data is not available. An alternate source must submit source approval information per NAVSUP WSS brochures, but approval time typically cannot delay award. The Government intends to solicit and negotiate with only one source under FAR 6.302-1, though all responsible sources may express interest and capability. Drawings are not available, and the acquisition is not being made as a commercial item.