I'm about to do this conversion myself, all you need to buy is the caliper, while its out, buy a caliper rebuild kit, some decent pads and slotted rottors.
The brake lines fit up ok, but yes you have to re-tap the holes, off the top of my head they are M10X1.5 (thread sizeXpitch) but I haven't had time to have a proper play yet, apparently you have to machine something off, but thats as much as I know.