The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of four units of a flight-critical bushing sleeve (NSN 0Q-5365-LLRWMA005-SX). The item is currently unstable in design, necessitating significant changes that may render the existing configuration obsolete, and thus requires Government source approval prior to contract award. Interested vendors must submit detailed technical data and source approval requests, as only previously approved sources will be considered for this procurement, which is not open for competitive proposals. For further inquiries, interested parties can contact Jessica L. Harpel at (215) 697-2995 or via email at JESSICA.HARPEL@NAVY.MIL, with proposals due within 45 days of the notice publication.