Add to Cart Quick view Rectifier DR5173PF 172-12018 DR5173PF MSRP: Now: $22.38 Was: RectifierReplace OEM(s): DelcoFor: Delco 17SI Series 120A; 21SI, CS144 Series IR/EF AlternatorssUsed On: Delco 17SI, 21SI & CS144 AlternatorsBrush Holder Included: NoCondition: NewDiode Amps: 50... MSRP: Now: $22.38 Was: Add to Cart Quick view