Ok. About my 330mm 2 piece kit I can post some photos when I find.
It is an old project I took out of my car more than 3 years now. But it was made
from Galfer 330mm rotors and my friend made alu bells for Alfa 156 and
Bracket for Ferrari Maranelo calipers and these Galfer rotors.
The Galfer 330mm drilled rotors are very light and can be used with Marenelo calipers, because they have the same pad depth.
But you can not use the 330 drilled rotors from Galfer on Alfa Big(330)
calipers because of different pad depth.
For stock Alfa Big calipers can be used the Galfwer extreme line.
Are not so light like 330 drilled but are very solid and have the pad depth of Alfa Big caliper.
Link :
http://www.galfer.es/ANG/p_auto_dfx.html