Mine were completely gone on my M6, so ordered these, waiting to get them in:
https://www.ebay.com/itm/Set-of-4-x-...72.m2749.l2649
Liked how there is a border around the entire logo, unlike stock. I also chose black, as that everything is blacked out on my car. It's not an exact replica, but I like it, and I think it will look good on the gold colored calipers. I also don't like how the logo on one side is flipped 'upside down' as from the factory. Looks weird. There is a bit of fading in the caliper paint/powdercoat where the logo was, so when I flip one the other way, it might show. Hopefully this black version will make it less noticeable.