There are potentially a few issues you're going to have to deal with regarding the banjo bolt.
As eRacer mentioned, the thread pitch you want is M10 x 1.0. You can order up a banjo bolt with those specs from any of a number of suppliers (like Yoyodyne, as I originally did) and it will fit in the Brembo MC. However, if you are running aftermarket brake lines (such as the Galfers I have), the spacing between the fluid holes on the bolt may not match up correctly with the width of the brake line fittings.
An illustration better depicts the problem:
On the left, the top brake line fitting (gray) don't line up with the fluid hole (black dots) on the banjo bolt if you use the usual 3 copper crush washers. You need to add more crush washers to get the spacing correct, as shown on the right. (This is the same problem dayrock is describing, I think.) While this solution works, it's not ideal. It's a b!tch having to deal with all those washers.
I contacted Galfer about the problem, and they immediately sent me (for free) a new banjo bolt, correctly sized for both the Brembo MC as well as the width of their own Galfer brake line fittings. Here's a comparison:
I took the Yoyodyne banjo bolt out, mounted up the Galfer unit, and Voila! Everything was lined up correctly, using just 3 crush washers. Kudos to Galfer for great customer service.
Finally, everything's the way it should be.
Another look, showing my ghetto-fab mounting solution for the brake fluid reservoir. (It's a Brembo part I ordered from Yoyodyne, but there's no reason you couldn't use any other OEM remote reservoir.)