ok guys, i just did this earlier, and i tell u guys this its not that hard.
first u open the tailgate up,
then u see the 2 screw caps, pop them off carefully,
next take a 10mm socket and have some extension and take the 2 screws out
next close the tailgate, slowly and let it lock back, have the window down for even easier removal, i did
after that slowly slide the spoiler down, u should see 2 plastic clip that holds it
crefully remove the plug on the left, should b a that holds it
next take ur spoiler out, and open up ur trunk and set it there
then carefully remove the 2 phillips screws out, and then pop the light out, top first then bottom
besure to remove the plug from the bracket on the left of the spoiler
then take the light out, and then u should see a long wire
after that take the bracket out and use 8mm socket to remove the bracket from the light
next slide the 2 screws off the original light
then get ur other light and slide it back in
put bracket on and tighten it back up
feed the long lamp wire to the hole and put the light back in
put the plug in the braket
tight up the 2 philips screw
then take it out of the trunk, close the tail gate and set the spoiler on top of the truck
then plug up the socket
after that slide the spoiler back up to those clips, and it should lock it back up
open the tailgate and screw the 2 10mm screws in, and then put those caps on. and that is it, have someone step on braks to comfirm
i use a stick to jam the brake pedal and front seat to test and it works.