Welcome to the site
What are your plans once the rear spoiler is removed? There are holes under here so unless your replacing the spoiler with another then these will need filing.
You can try and get your hands on an se rear spoiler which most people are, or search the scrappys for renault 19 16v , peugeout 405 ,and other rear spoilers as these have been tried and tested and look good.
Post some pictures up if you can mate, would be nice to see the s12