This is a sole-source procurement for a flight-critical part (quantity 4) requiring Government source approval, with delivery FOB origin. Only previously approved sources can supply the item, and new sources must submit detailed source approval information as specified in the NAVSUP WSS brochure. Proposals from responsible sources will be considered within 45 days of publication (or 30 days if an existing Basic Ordering Agreement applies). Interested parties may identify commercial item capability within 15 days of this notice. No budget amount or performance location is specified, and drawings are not available.