I have this light installed. I used the two wiretaps and I don't remember if it comes with a post ring for the ground wire. If not you might want to get a ring to put off the ground screw in the trunk to make sure its secure.
This light for the usdm market is a bit different than the one sold in japan and australia. Since this light doesn't have the fog light connector they wired the middle brake light to the parking lights. This causes the middle brake light to be on whenever the parking lights are on and the brake light leds are much brighter and it doesn't quite look right. It still flashes when the brakes are pressed though. Unfortunately it's not as simple to take this light apart as it is for the valenti light since this light is sealed similar to a headlight.
My pictures are broken but it may help with the process to take the light apart.
http://www.ft86club.com/forums/showthread.php?t=114970