The carbon lever blade in the Maven ULT Tuning Kit (part number: 00.5018.278.000) is compatible with Maven A1 ULT and SLV.
Maven A1 BRZ and Maven Base both use a different lever interface and are not compatible with the carbon lever from ULT or the updated SLV lever found in the Tuning Kits.
Please note, you must use the updated SwingLink with the updated levers, and vice versa.