Right, M62 which is the charger in question here does take one bottle. I would probably recommed picking up two only for a future oil change.
It is much easier and quicker to remove the SC than the bracket. That bracket is a monster that has a bolt on the back side bottom of the motor etc.
You will need the SC to LIM gasket (Felpro comes with the yellow coolant port o rings, GM does not)
Red gasket maker (very small tube)
TB gasket to clean the TB while it'* off.
Possibly injector O rings if they look bad. Felpro packets typically include only 4 rings.
Some time. and you should be all set.