If you are fitting yourself, then measure, check, measure and check again before drilling any holes. If you lift the boot lid and look at each side you will see a plastic/rubber grommet, pull this off and then look inside you will see where you would need to drill. Good luck with finding an OEM spoiler. There maybe a few people on here with one tucked away as some like me have opted for after-market spoilers (mine never came with a spoiler).