You're going to need to take a closer look, on one side the plates are attached to the radius arm mounts, the other side the plates have a jog in them to bolt to the wheel side of the swivel flange-just the lower couple of bolts it seems.
It'd be a royal pain the proverbial trying to get the swivel bolts in and torqued up, its hard enough as it is without the extra thickess!

