Yeah dude stay away from the oem bags. Air Spring Supply company in Durban supplied me with Continental bags that never gave me an issue. Can do it at home, 1 hour elapsed time to install and the thing that took the most time was getting that damn circlip on at the bottom.
///MPower FTW!!! Torque FTW!!!
All you need is a jack, long nose pliers and time.
///MPower FTW!!! Torque FTW!!!