From the notice

TR-317D and TR-353A Transducers and Spare Parts Production. The contractor shall design, document, manufacture, test, package, and deliver up to 40 First Article TR-317D transducers and up to 40 First Article TR-353A transducers (if First Articles are not waived), and up to 25,000 production TR-317D transducers and up to 5,500 production TR-353A transducers which meet the performance requirements of the respective TR-317D and TR-353A transducer Critical Item Performance Specification (CIPS). The contractor shall also manufacture, test, package, and deliver up to 5,500 TR-353A Installation Kits, up to 5,000 TR-353A Housings, up to 5,000 TR-353A End Seals, up to 5,000 TR-317D Vulcanized Body Assemblies, up to 5,000 TR-317D End Seal Assemblies, and up to 5,000 Vulcanized Housing Assemblies which will be build-to-print items in accordance with the respective drawings.