I've done it to my '05 back in '06 after it leaked out the pinion shaft (warranty fix). Did the mod, but it leaks there anyway again, so useless mod in my case. I fill a bit once a year and that's the end of the story.
I would not buy that BS kit unless you plan to ford a river. $35 for that nonsense, seriously? I paid a couple of bucks for a nipple, used some old hose I had in my junk pile, and that's it.