I posted these somewhere else but this seems like this can be a dedicated Blue Bat overlay thread and he wanted one on NASIOC!
Here is my '04 WRX which I recently installed 20% reverse light tint on as well as 20% spoiler third brake light. I love it and it was fairly easy to install, just needs a little finesse! I used warm water, dish soap, a blow dryer and a credit card wrapped in a damp cloth.
Blue Bat is an awesome guy too