The National Institute of Standards and Technology (NIST) is seeking information from vendors capable of producing 60 cuvette-shaped glass units for the renewal of NIST Standard Reference Material 2943, which is critical for fluorescence spectroscopy applications. The procurement aims to ensure that the new glass units meet stringent criteria for emission and absorbance spectra, spatial homogeneity, and optical quality, aligning closely with previous standards. This Sources Sought Notice serves as a preliminary step in market research and does not constitute a solicitation for proposals; NIST anticipates issuing a Request for Quotation in late 2025. Interested parties are encouraged to submit their qualifications and capabilities via email to Tish Walker at latish.walker@nist.gov by the specified deadline.