Front and rear bushings were same on mine.
There were two different options depending on whether you were using OME shackles or stock shackles.
I'm running aftermarket boomerang shackles, and bushings designed for stock shackles.
The bushings designated for ome boomerang shackles didn't fit properly with any configuration I could come up with. I had to return them.
Basically (I think) you should only get the bushings designed for OME shackles if you are installing ome shackles at the same time.