Thanks for the info...and yeah, that 3rd brake light caused a lot of rattles in my Accord, till I decided to take it out. I haven't had it in for half a year now and haven't gotten pulled over. Out of curiosity, what is the method the member on SSA mentioned to you without having to cover the 3rd brake light?
As for expanding foam, that is a great idea. I would do that myself, but the lights are on the trunk lid. I did put expanding foam in the rear quarter panels and the c pillars and it made a HUGE difference. I'd say doing the trunk lid will make a very big difference and you'll be happy.
Thanks for the link on the lights, I appreciate it.