well man you could do alot of different things to make it work. if you want it like the engine was in there stock you need.

engine, tranny, shift linkage, axles, ecu, pretty much everything under the hood. there's pieces of your car you can still use though to save on costs.

I suggest you do a search or post this in the hybrid forum. there's no point in writing the same thing over and over just in different threads.