This opportunity is for the procurement of 4 Transmitter Receiver spares (with a range of 1 to 6 each) for the KC-46 aircraft, with delivery required on or before December 5, 2026, to destination SW3211. The item is manufactured by Rockwell Collins (CAGE 13499), and the government does not own the data or rights needed to manufacture it, so interested firms should contact the OEM. This acquisition is not set aside for small business and is not a commercial item purchase; the government intends to solicit and negotiate with only a limited number of sources. The performance location is not specified beyond the delivery destination, and no budget amount is provided. All responsible sources may submit a proposal, but the government will consider responses within 45 days of this notice to determine if competition is possible.