This is a Sources Sought Notice for the INTERFACE UNIT,INPU, a critical component for the Abrams Fighting Vehicle System (AFVS) Engine. The government requires 9 units with an option for 100, but lacks full data rights and suitable drawings for competitive procurement. Interested contractors must meet Source Approval Program requirements, including vehicle-level qualification testing at their own expense. The response date for capability information is 28 May 2026. No budget amount or performance location is specified.