OMG! That's like mine, from JL Motoring. Poor fit for sure. I still have it on but not so happy about it. I used black silicone to fill the gap just on the sides but it's still short on the ends. I have pics of before and after on the diy section. I can't post the link right now but can get it later, if interested.
Seems like fitment is an issue and there are inconsistencies even with "original" ones. This thread is old so what was the final result? Did you return it? Sorry if I missed a reply on the final result.
2011 M3 ZCT DCT MW Bamboo Mods: CF Rear Spoiler, CF Hood Vents, CF Reflectors, CF Mirrors, CF Front Lip Spoiler, CF Kidney Grilles, CF Steering Wheel Faceplate, CF eBrake Handle