This is a genuine GM High Mount Lamp assembly for your SSR. You can find references on line as GM p/n 15133728 and GM p/n 15187333. It comes with new 3M mounting tape already on the back side.
It fits all SSRs, 2003-2006.
The only known stock is at Wild Bill’s SSR Parts in Steubenville, Ohio.Visit Wild Bill's SSR Parts