Mineral White M4 convertible owner. My shop had no issue matching the Mineral White color on the M3 Lip Spoiler I installed.
Not sure what the deal is with the color matching of the IND reflector tabs. I have seen many pix and agree they don't look like 100% match. I wonder if it is the size of the element itself that causes issues. I have amber reflectors and enjoy them as such. I can't say with 100% certainty whether my shop would do a better job than IND at color matching.
I have purchased items from IND, just not the reflector replacement pieces, and have had great service. I gave them first crack at doing the spoiler piece in MW, and they respectfully declined due to color matching issues. I was fine with that.
Here is a shot of M4 rear with M3 lip spoiler installed.
