[cinderfellavr6]

Looking for any and all information about swapping a mk5 5 cylinder into a mk4 platform. Engines are easy to come by but I am wondering what year/model engine harness I will need as well as ecu. Since its a TT I am hoping to mate to the o2m trans in the car to keep it awd, can I use a 1.8t clutch and different flywheel or no? And I know I will need a different motor mount just not sure which one exactly.
Any help is appreciated, here's a pic of the car.