your gonna need the oil and coolant pipes from the K04 (Bam or APX engine) as they are slightly different, and id advise the injectors that came on the car the K04 was fitted to, as well as manifold and downpipe. If youve got an upgraded FMIC then pipework should fit from an S3 (got a load of spare stuff you could use that i didnt use if your interested, PM me)
Just finished the same conversion on my AGU (its in a mk3, but engine work is the same) and well worth the hastle. Make sure you get the "spike" mapped out of the turbo though when you get it mapped!