This is a Sources Sought Notice to identify businesses capable of supplying Insulation, Thermal spares for the AH-64 Apache helicopter. The anticipated contract is a Firm-Fixed Price, Indefinite Delivery Indefinite Quantity (IDIQ) with a 60-month base period of performance and a possible six-month extension. Performance location is not specified, and no budget amount is provided. Only Thermal Structures, Inc. and Boeing currently possess the proprietary technical data required for manufacturing. Interested parties must demonstrate access to this data or explain how they can meet requirements without it.