The requirement is for 10 pairs of NSN 3H-3110-009921018-NT under TDP version 009, delivered FOB origin. The part requires engineering source approval by the design control activity because the approved source(s) hold essential data rights, engineering knowledge, or technical data not economically available to the Government. Alternate sources must qualify under procedures approved by the cognizant Government engineering activity. The Government is not using FAR Part 12 commercial-item policies for this acquisition, though interested parties may present commercial-item interest and capability to the contracting officer. Specifications and standards are available via DODSSP/ASSIST-Online, but patterns, drawings, deviation lists, and purchase descriptions are not stocked at DODSSP.