This part is listed by BMW as part number 11 51 7 831 099 and is described as Water Pump for the S54 powered E46 M3. These are the models with the 333hp engine with 6 individual throttle bodies.
The water pump on the M Roadster and M Coupe models were specific to the MZ3 and MZ4, and are not interchangeable with the E46 M3 type pump. This is the Genuine BMW replacement pump which is correct for all S54 M3 Coupe models from 2001 through 2008.
This water pump was revised and improve by BMW several times. This pump is the latest version and includes all past improvements in design.