suspension parts wise the only differnce is the lower control arm, the 89+ has eyelet shocks, the 88s have a bracket style. Most of the good companys make them for the 88s, but if you want you can just swap out the lower control arm- it will bolt right on. Yes the 90-91 crx si's rear disc will bolt on, as will the 91+ integra rear disc - they are the exact same, no differnce at all. You can swap the entire trailing arm, or just the spindle, I just changed the spindle on mine. You will need emergency brake cables from a crx, you can use teg ones but they're longer so you have to poke them up under your gas tank or something (not a problem, just telling you). Yes the larger master cylinders and boosters from the newer tegs will fit, but which ever you use both need to be either abs or non abs, you cant mix them.