been there before and the slot can be a little hard to find if your looking at a maintenance manual picture. The slot that the tool fits in is U shaped and it's located on the shaft that the pulley and clutch attach too, not behind the clutch as most pictures make reference to. Look behind the pulley at the 1:00 o'clock position, if your looking directly at the clutch, and you should see it.

I can barely see it on my car if I hold my flashlight near the thermostat housing and point it behind the clutch pulley on the shaft.

Good luck and if you still can't find it I will go out and take a picture of mine and send it to you.