The Naval Air Warfare Center Aircraft Division intends to negotiate a sole-source, fixed-price modification with D2 Incorporated in Bourne, MA, for a spares support package for three specific particle counter systems. The procurement is justified because D2 Incorporated is the original equipment manufacturer and sole owner of the necessary technical data, preventing full and open competition. This notice is not a request for competitive proposals, but the government will consider responses received within fifteen days of the notice's publication. The point of contact for receiving a Request for Proposal is Mr. Paras Patel. All offerors must be registered in the System for Award Management (SAM) database.