The bushings that come installed in the shocks are too small to fit over the mount on the 4runner axle housing. Too bad because they are nice bushings that look like they'd last a long time. I bought two sets of bushings that will fit the 4runner just in case they let go.
Here is what the shock looks like out of the box next to the bushings I used.
The stock bushings were super easy to install. Less than 5 minutes for both shocks.
The stock bushing, although too small, looks like it would outlast the 4Runner replacements.
Inside diameter difference.