This is a Sources Sought notice for information and planning purposes only, not a solicitation for proposals. The required item is a Cylinder Head, Diesel (NSN 2815-01-446-5425), and interested firms must indicate their capability to provide it. Respondents must submit company details, size status, and a capability statement; questions must be emailed to the contract specialist by May 20, 2026. No budget amount or performance location is specified in the notice. The government will not reimburse any costs incurred in responding, and no commitment to procure has been made.