1. E90, 92, 93 uses exact same side grilles. So you can use Edition grills if you want.
2. I have gloss black on my E90. Main reasons I chose gloss black are:
a. matches gloss black outer trims include side mirror.
b. M3 label on the side grill has gloss black background so I wanted to match better.
c. Match with my gloss front grills better too.
But looking at yours, I kinda like color matched one as well. More luxurious look than black.
PAST: 11 E70 X5M | 08 E90 M3 | 08 E92 335i | 03.5 E46 M3 | 99 E36 M3