I bought a new Camshaft Position Sensor, and I want to replace the correct one. Does anyone know where it is?

I'm getting:
P0393 Camshaft Position Sensor 'B' Circuit High Bank 2
There is a sensor on each side right on top of the cylinder head in clear sight, but where are the other two? From what I've read sensor B is the exhaust camshaft.. It's not way in the back of the engine, is it?

If it helps, the sensors are 07L 905 163 C
Thanks,
Marcus
Edit:
Mechanic buddy looked it up for me. The other sensors are farther down, below the heads of the coilpacks. I had assumed that they would be up, not off to the side and down.
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