If you look closely you will see small factory dimples where the holes have to go. I'll see if I have a pic of my firewall. There are 3 below the big hole for the fan motor and another for the wiring just to the left of the plastic heater box housing. There are also 2 dimples on the radiator support panel, left hand side, where you have to drill for the condensor pipes. They come through the left hand radiator support mounting bracket.
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Found it....
I've put a blue circle around the dimples. You will notice the one on the right, near the fan hole, has 3 dimples. Thats because you need to drill 3 holes, obviously. Two are for the heater pipes and the third (middle hole) is so the rubber grommet will fit in between the pipes....if you know what I mean.
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