This is a Sources Sought Notice for market research, not a solicitation or request for proposal/quotation, to identify potential manufacturers of a B-2 Heat Stack (NSN 1630013527008) under a firm-fixed-price contract type. The applicable NAICS code is 336413 with a size standard of 1,250 employees, and the Government is interested in both small and large business concerns. Interested parties should identify their business status and demonstrate that they possess or can obtain rights to the proprietary data required to manufacture the item. The Government does not own the data rights; suppliers must have or obtain technical data and drawings from Honeywell Aerospace US LLC (CAGE: 55284) and authorized vendors.