Its very straight forward, well at least it was on the mark VIII, I had to contruct a 12" top cup with a plate to keep it bolt in, but I welded the bottom bag plate to the LCA I did that to keep the bag from moving around.
If the back is IRS like the Mark it will take about 2 hrs to do the fab work on the rear.
its a matter of pulling the springs out, and making 2" cups on the bottom and 1" on top.