Also did the AJ-USA pedal change myself. I really liked the high-tech look. I bought them from AJ and also purchased the heel-and-toe attachment to the gas pedal. I've got narrow feet the the additional width helped. I also purchased a set of aluminum floor panels from GT-Racing for both the driver and passenger side that replaces the plywood versions. It probably is heavier and is expensive for what you get but the look is impressive (if only I could drive as fast as I looked).
As mentioned in the previous post, installation is straight forward. Remove old rubber pedal covers, overlay new pedal covers, mark hole locations for attachment bolts, drill and bolt on new cover facing. The gas pedal is a direct replacement for the current one using all stock location and mounting points.
Rick