The Government intends to solicit and negotiate a sole-source contract under FAR 6.302-1 for 6 each of NSN 7R-1680-015855100-P8, with delivery FOB origin. The item is flight critical and requires Government source approval by the design control activity; approved sources retain essential design/manufacturing data, so only previously approved sources have been solicited. Interested responsible sources may identify their interest and capability, but this notice is not a request for competitive proposals. Non-approved sources must submit the source-approval information required by the applicable NAVSUP WSS brochure with their offer; offers lacking required data or prior submission documentation will not be considered. The Government is not using FAR Part 12 commercial-item procedures, though interested parties may identify commercial-item capability to the contracting officer.