This is a sources sought synopsis for market research to identify potential sources for spares procurement of a hydraulic oil cooler for the F-15 aircraft. The required item is NSN 1650-01-228-8118RK, part number UA538795-3, with an estimated spares requirement of 9 units. Interested parties must register as interested vendors, and the government may consider breaking the requirement out by airframe. Performance will be at Tinker AFB, Oklahoma. The government is seeking input from all business types to determine if the effort can be competitive or set aside for small business.