Nick, while I completely respect you're professional opinion as you deal with this everyday, I beg to differ on the fitment of the BMW Competition Spoiler. I test fitted one to my car and it absolutely did NOT fit as that spoiler is specifically designed for the coupe. Definitely not the convertible. Unless they make two versions, which I dont think they do.
2015 F86 X6M
2015 i3-REX- 2012 Wrangler Unlimited