Actually not sure the correct name - wind damper, it is made of fiberglass - "c" shapped and some how either is bolted onto the back of the trunk and has a brake tail light in the center. How does this fit and is it easy to install. Is the tail light for the brakes wiring there already?

I have a GS300 2002 year.

 

You mean a spoiler? One like the spoiler from the factory or an aftermarket one?

Like the one on my GS below (a factory type)

 

I really dont know if your looking for some type of mechanical electronic controlled wind damper to reflect wind? I.E. V W Corrado, or just a simple spoiler?

 

If your car doesn't have a rear spoiler already, then there are two types you can choose from. The kind in DaveGS4's pic above, is a bolt-on which will require drilling to mount, and usually has a built in third brake light. I'm not sure if the trunks are pre-wired for a spoiler light, but it's kind of awkward having a brake light in your rear window, and another on the spoiler... ask DaveGS4, he spent some time with this issue
The other kind of spoiler, is sometimes called a 'lip' spoiler. It's smaller and usually held on with adhesive (sounds cheesey but really isn't) Do a search for 'TTE lip spoiler' or 'Sport Edition lip spoiler' to see pix of what they look like.
Also, browse the GS gallery for lots of pix of different spoilers.
HTH