The SM 7850 Alternator Rotor Assembly is a high-precision electrical component designed for the Bosch-style (B. Type) charging systems found in the later generations of the Tata Indica Vista and Indigo eCS (Compact Sedan). This is a "Pump Type" rotor, featuring the integrated rear splined shaft required to drive the mechanical vacuum pump for the brake booster. Built to O.E. (Original Equipment) Specifications, this rotor is specifically calibrated for the Quadrajet and TDI engines used in these updated Tata platforms.