This is a Sources Sought notice for market research to identify potential suppliers for the spares procurement of a DIFFERENTIAL GEAR U component for the F-15 platform. The estimated requirement is for 38 units, and performance of services will be at Tinker AFB, Oklahoma. Potential sources must be capable of new manufacture, including labor, materials, inspection, testing, and shipping, and may also handle supply chain management and nonrecurring engineering costs. The government is interested in all business types, including small and disadvantaged businesses, to determine if the effort can be competitive or set aside. No solicitation is available at this time, and no funds are allocated for this market research.