03-04 Cobra Rear Spoiler
 

Where can I find one of these and what is the cost?

Check with Randy but

2003 Cobra spoiler is $349.95 not painted.
and you'll need a new 3rd brake light assembly for the Cobra which is $88

or you can check ebay once in awhile.....it aint cheap

I seriously considered doing this swap once. It was gonna run like $800 the way I figured it. Not worth it unless your decklid is already free of holes.

Geez that's pricey, I guess i'll just keep my eye out for a black one on ebay so I won't have to have it painted and it will come with the third brake light.