It could be that i dont remember IT since i did Mine some time ago but sti allways Delivers a sticker with the marks for Drilling. I did Mine some wile ago and i followed 100% the manual. It was super easy took me maybe 1h. I will See If i still have the manual.
The Installation was super easy dont ve afraid to Order it. I can Check If i still have the japanese manual. I think the old Spoiler Had two Bolts that You need to remove. I will Check If i have the manual. But i did Not drill anything.