Then repeat 3 more times....
Now onto the stop plates. I happened to have this 3/4" thick OSB left over from a previous project, but you could use virtually anything as a stop plate. I cut them, measured, drilled holes, then transferred to all sides of the stands. Then I used a T handle allen wrench to install the threaded inserts so I could bolt the on and off.
I then chose 2 to be my dedicated front tire stands and installed the inserts for the turn table bearings.
And pics of them installed: