Good luck. I tried for a month to find a GMPP/Koni package used for cheap. They are hard to come by. No one wants to give them up. Guess that means they are good.
I ended up just ordering it from ZZP. Its more expensive to buy than GMPD, but it costs ALOT less to ship. ZZP shipped was less than 900 while GMPD was over 1000 shipped to your door.