This is rebuild conversion kit for Delco 10SI alternators. This kit includes all new parts: 1 Diode trio , one 12 volt voltage regulator self exited , rectifier, brush and holder, 2 bearing ,batt. stud kit, regulator port block off plug, & 4 new screws 2 insulated & 2 plain. Fits all automotive and some agricultural 10SI alternators.wai global