Originally Posted by Checkcaptain
European and US calipers are identical on the front 380mm Brembo BBK.
Rotor, bell, hardware kit, pad and brackets are different.
It is no problem to use a complete European rotor kit with a US spec caliper and also the other way around
Rear kit is identical in Europe and in the US.
Presently I am using an European rotor kit with US spec calipers and brackets.
I live in the US and all I have to go by are brochures and pictures in this forum:
(included in post 1)
US Application List
Also check out this thread I started wondering about it: http://www.m3post.com/forums/showthread.php?t=808479
And this thread where OP post clear pictures of the fronts: http://www.m3post.com/forums/showthread.php?t=815024
Here the fasteners look different than the McLaren fasteners on mine.
The above list
US spec E9X M3 380 kit as: 1N1.9003A = N caliper
TUV approved E9X M3 380 kit as: 1M1.9022A = M caliper
Note that the 1M 380 kit in the global brochure is the same as the US Spec 380 kit. So you may well be using that and consider it EU spec.
Also, I believe that the GTS caliper is the M caliper based on specs and pictures and I am sure I will be soon confirmed by Aleks' build in my neighborhood.
Rears are the same.
In short, my assessments are based on data that bling consumers like myself have access to and not speculation on my part.