why would you think it would put the brake balance out?
the 20v and 2.4JTD models have discs standard, i guess you would need the trailing arms, calipers, brake flex pipe (maybe solid aswell), set of disc's.
it'll be the same as doing it on the bravo so i would see what they are using to do it, i've had a little search but couldnt find a thread on it, sorry.
you may also, if you have it, need to check which size ABS sensors you have as they differ depending which system if fitted.
Ry