This is an unrestricted solicitation for a sole-source, firm-fixed-price purchase order to supply ten units of a modernized replacement component (Part Number 899-3100-XXX) for the legacy P/N 899-3100-117, currently in engineering development with no commercial equivalent available. Only items with clear traceability to the Original Equipment Manufacturer, Telephonics Corp, will be considered, and offerors must provide a Certificate of Conformance per FAR clause 52.246-15. No drawings, specifications, or schematics are available from the agency. The requested delivery date for the items is September 19, 2028, and an anticipated award date is on or about September 9, 2026. The applicable NAICS code is 336413 with a small business size standard of 1,250 employees.