The Government seeks 879 each of NSN 0R-2840-017141155-B8, reference 5144T23P02, delivered FOB origin. The item is flight critical, and the Government lacks sufficient accurate or legible data to buy from other than the current source, so only previously approved sources have been solicited and new-source approval is required before award. Non-approved sources must submit NAVSUP WSS Source Approval Brochure information with their proposal; offers missing required data or documentation of prior submission will not be considered, and award may proceed based on Fleet support needs if approval cannot be completed in time. The action is intended as a single-source negotiation under FAR 6.302-1, and all responsible sources may identify interest and capability, though the notice is not a request for competitive proposals. Market research indicates FAR Part 12 commercial-item procedures are not being used, though interested parties may identify commercial-item capability to the contracting officer.