This is a non-competitive, sole-source notice for 60 units of a specific part (NSN 1H-5920-016277253-X3), requiring engineering source approval from the design control activity. Delivery locations include New Cumberland, PA, and Tracy, CA, with an initial issue to Adirondack Electronics Inc. in Round Lake, NY. The government intends to negotiate only with the approved source, which retains essential data rights and manufacturing knowledge not economically available to the government. Interested parties may express capability and submit quotes, but any alternate source must undergo government-approved qualification procedures. No budget amount or submission deadline is specified in this notice.