Both are included in the kit:
The clamp attachment with the ball joints is very stable and can be attached to the handlebar within seconds. The other attachment can be glued to the helmet or motorbike, similar to the GoPro attachments (see 2nd picture). The metal extension is GoPro compatible.
What I cannot see in the pictures is the intermediate piece from the ball joint to the GoPro... but this is also included in the kit