Just purchased and had installed the following
Brembo GT kit on my 2008 BMW M3.
Part numbers 1N1 9003A2 R / 1N1 9003A2 L
I couldn't find a post that verified that they fit my Stock rims. Some posts hinted that they were very tight.
So here is my experience.
1) YES they do fit. See picture.
2) BMW shop installed and said everything was fine for clearance.
3) I observed approximately 1/4 inch of clearance around the rim (19")
And for more detail...
They are awesome!