fairly straightforward job.
are you sure they need rebuilding, or are they just not grabbing as you think they should? are they leaking, or are the pistons frozen?
is it possible that you did not bleed the rears correctly by jacking up both wheels at the same time and setting the axle on jackstands on both sides.
i have a service manual and have scanned an exploded diagram. send me an email for a copy including brief instructions:
m bouse (no space) at chartermi dot net