This is a sources sought notice, not a request for proposal, aimed at gathering industry feedback and capabilities. The requirement is for contractor support to design and prototype replacements for obsolete parts of the IM-272A/WDQ Air Particle Detector. Specifically, the government intends to procure two prototypes of each of six listed parts and requires performance testing to ensure compatibility with the existing detector. No budget, performance location, or submission timeline is specified in the notice. Interested parties should review the attached draft PWS, market research questionnaire, and sources sought notice for further details.