This is a Sources Sought notice to identify potential suppliers for 37 Circuit Card Assemblies, with an option for 37 more, used in the Abrams Fighting Vehicle engine. The government lacks the technical drawings and full data rights needed for a standard competitive procurement. Interested contractors must be willing to qualify under the Source Approval Program, including funding their own vehicle-level testing. The TACOM Life Cycle Management Command oversees this qualification process. This is a market research survey, not a solicitation, and responding is voluntary with no government financial obligation.