There are two different designs of "rear window louvers". The kind David posted, and a slightly different one from Hall Pantera, both covering most of the deck. They are often called 'Miura-louvers'.
Then there's the Type 2 that attach to the open 'window' hole in the deck lid with only 5- 6 black metal slats, & stand almost vertical like window shades. I was initially confused as to which you wanted.