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Here ya go
It's pretty clear when you explode the picture like this. There is a pointer pointing at the mark just to the right of what looks like the crank sensor directlly above the crank. The mark is at about 2 O'clock right behind the belt. There should be something on the housing right in that area.
OK, I just found a closeup of the crank mark. It really doesn't get any better than this.