I have some pictures of how I did my brake pedal. I wanted to use the 2003 pedal. The 2003 has a large plate that mounts to the firewall. It has the hole for the steering column, and the hole for the brakes. I just lined the hole for the steering column of the plate, to the '72 hole on the firewall. Then I cut the holes out of the firewall to match the plate, and bolted it in. This puts the 2003 brake pedal too far to the left, so I had to bend it in the right location.
Here is a picture of the old brake pedal in it's original position, and the new pedal in it's original location.