The requirement is for 51 each of NSN 7R-5998-015191467-V2, delivered FOB origin, and the item is flight critical. The Government intends to solicit and negotiate with only one source under FAR 6.302-1; only previously approved sources have been solicited because the approved source(s) retain essential design, manufacturing/repair, or technical data not economically available to the Government. Government source approval is required prior to contract award, and new-source approval normally cannot be completed in time to delay award. Non-approved prospective bidders must qualify through NAVSUP WSS procedures and submit all Source Approval Brochure data with their offer, including a copy of any pending source-approval cover letter; incomplete submissions will not be considered. No drawings are available, and the acquisition is not using FAR Part 12 commercial-item procedures.