I put in my technostalgia tail lights on my 2012 V6, then took them out and put them in my 2012 SS. While taking them out of the V6 I dropped the 10mm wrench inside and it dropped down into the bumper assembly. I was trading in the car but could not get the wrench out for the life of me and i wasn't about to take off the rear bumper to get the wrench. I left the wrench in there and traded the car.
It is a pain in the @ss to change out the tail lights to put in the techo lights but it can be done. Especially watch out for taking off the tail light bezels. They break very very easily. Ask me how i know :(
On a side note the techno lights look killer!
