They call that part an outlet (104 203 04 31). Seal ring is 017 997 23 48 and the bolts are 910143 008012.
There is also a seal ring 017 997 21 48 that goes between the head and the front cover for coolant.
The outlet bolts should also hold an engine lifting bracket (suspension eye) 104 223 14 41. If not installing it you will need 2 M8 washers for the bolts.