ISR OE Replacement Water Pump - Nissan SR20DET S13 These are OE Replacement Pumps, similar to what you would get if you went to an auto parts store to buy a replacement pump for a car. These are not OEM Nissan. These are OE Replacement. Stock studs need to be reused. Requires the use of RTV Silicone Gasket makers Enjuku Racing is the first to bring OE Replacement JDM Parts to the US. Fits S13 SR20DET RWD Only ** All ISR Performance Products are Designed for Off Road Use Only **