I'm leary about just "giving" you the info straight up. Not to sound like an ass (that's not my intention), but if you have searched the numerous threads about Evo brakes, and stock brakes, and stock-type conversions (i.e. converting rear drums to "factory" discs), then you should have all the answers you need. You would be able to tell that the Evo calipers bolt right up to the Eclipse spindles. My concern is that you think a mounting bracket is needed with the Evo calipers...this makes me think that you don't know a lot about brake systems, which is kind of scary...brakes are the one area that should not be modified unless you know what you're doing...if your brakes don't work, you put everyone on the road at risk.
To add a little education to this, so you don't think I'm just being a jerk, the Evo's have what is known as "fixed" calipers, meaning that the calipers bolt solidly to the spindles...they have built-in mounting bosses instead of separate mounting brackets...this is because they have pistons on both sides of the rotor, so the caliper can stay still while the pistons & pads move in & out. The Eclipse on the other hand has "floating" calipers...they use a bracket known as an "abutement" that the caliper mounts to with sliding pins, and which also holds the pads in place...as the pistons (which are only on one side of the rotor) move in and out, the pad on the outside is pulled by the caliper housing which slides in the abutement. In essence, the pistons in floating calipers move twice as far as those in fixed calipers because they have to pull both pads against the rotor.
I'm assuming you're having someone build your engine/turbo setup, and would be having them install the brakes as well (I hope). If you're planning on doing this yourself, I think that's great...as long as you take the time to learn more about it before you go buying parts. Do your research, not just about the application specific parts, but also how the systems you're planning on modifying work, then start looking into buying parts...but the research should be on-going and really never stop...