The contractor must design, document, manufacture, test, package, and deliver up to 40 First Article TR-317D transducers and up to 40 First Article TR-353A transducers, unless First Articles are waived. It must also produce up to 25,000 TR-317D transducers and up to 5,500 TR-353A transducers meeting the respective Critical Item Performance Specifications. In addition, the contractor must 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. These spare parts are build-to-print items to be produced according to the applicable drawings.