3rd brake light leak

Thinking that I have a leak from the cargo light. I ordered a seal from Amazon and it looks like it's for the lens. Is there another one that goes behind the whole light to seal to truck ?
I have a 2014 Crewmax

 

Yeah there is one that goes between the third brake light housing and the body of the truck, its a black foam one. I tore mine to shreds trying to get the housing off and didn't think much about it.

 

How hard is it to get the light off ? Heard you have to take headliner down to reach some bolts

 

Leaking into the cab? Someone else on here had that problem to when they found water on the window IIRC.

 

Yeah, remove the bolt under the airbag logo on the driver's side rear pillar and you should be able to pop the 4 fasteners and drop the back of the headliner. The bolts you're looking for are right behind the light in a hole in the roof. They are almost parallel with the roof so you'll need to point the socket towards you while your standing in the bed of the truck. If your rear window doesn't roll down you'll need to remove the entire headliner to get access.