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The inductive cover is modeled to exactly match the existing back cover and is just slightly thicker. As you can see on my Droid Charge the cover fits well and has an opening for the camera and speaker.
The inside part of the cover is where things vary as you can see here. There is a charging/connection system on the replacement back.
You can see where the connector on the Droid Charge back contacts the gold piece on the new back cover when placed together.