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Not the best pictures but if you look at these and then under your car it should be obvious.
What I found was:
.Undo the fill cap before the drain one because it can be a bit stiff and you don't want an empty gearbox you can't refill.
.Don't lose the washer in the oil you've drained out
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.Stop filling when it starts to dribble out of the fill hole (the top hole)
.It should take about 2.4L
.Tighten them back up to about 23LB/F (I just did it quite tight with a smallish bar) as long as you don't go mental it'll be fine.
.You'll need a long funnel and the tool I mentioned a few posts above.