I was able to get some info from Kahtec on the Resistor to use. Though they said I shouldn't need one (I have a 2004), if I did need one it would be a 6ohm 50W one. They also sent this picture on how to wire it in:
I purchased the Smart Stop Delay version and a 6ohm 50W resistor off Ebay. They arrived last week and I was able to install them this past weekend. I took some pics of the installation as I went, following the instructions in this post. The only real tricky part I ran into was that both wires on the third brake light adapter were black which made it difficult to tell which was + and which was - (a tester would be a handle tool if you plan on this installation). I was able to get it installed and working - it does take some assistance, need someone to press the brakes while you are observing the results while wiring things in. Other than that it was pretty straight forward and works great.
Here is a picture of the screws you need to remove for the third brake light (there are two of them):
Then remove the connector (note both wires are black) - there is a tab on the clip you depress to remove it:
Here is the Smart Stop Delay and Resistor I used:
Wire it in following the directions from Kahtec:
Wire in the resistor (follow directions in the image provided above from Kahtec):
Have someone help test the light is working as expected (delay, etc) - I did this first after installing the Smart Stop and then again after installing the Resistor, and before I re-attached the third brake light.
Once you confirm everything is working, you need to find a place to hide the smart stop and resistor. I ended up making a small slice in the weather stripping and putting both parts inside the lining where the roof is stored like this:
Not sure if there is a better place to store it or not, but this seems to work. I also checked the light after a few days to make sure it (and my rear brake lights) were functioning correctly - just to make sure after driving for a bit none of the connections came loose.
Here is a video of it installed and working:
http://youtu.be/o5YqufFLKtA