If i was to get the Central Locking Unit with a keyfob from a donar car(MK4 Golf), could the unit be fitted in a car(another MK4 Golf), which hadn't originally left the factory with remote central locking? Would this literally be a plugin job.

Is this an achievable goal, or is there something i am completely over looking with ignorants.

Secondly if this was the case, where is the Central Locking Unit located in a MK4 Golf?

Many Thanks