The water pump is very common since it is the same pump for all 112 and 113 (three valve V6's and V8's). My V8 was missing the water pump so I used the one off my V6 when I did the engine swap. There are a ton of bolts holding it on. You need female torx sockets. Be very careful about the torque of each bolt. they can break easily and you are screwing them into aluminum.