3rd Brake Light

I know there is an old thread on this subject but some of the questions that were asked werent answered so im gonna ask again. I have a '96 GSR and i have purchased an ITR spoiler which doesnt have a brake light. And we all know required by law u gotta have that dang 3rd brake light. I need to know how much one that u mount in the rear cabin will cost and is it a bitch to install? any help would be great thanks in advance.

it's not that hard to install. you just find the wire that was used for the oem wing and route it into your cabin and hook it up to the new 3rd brake light. the easier thing to do is to just buy a type-r style wing with the 3rd light built in.