If you were working for me, I'd say go redesign the joint so that most of the load is taken in shear. That bolt is definitely in single shear and bending and, depending on the direction the load, is in tension too. Unless you get an even load on both of the rod ends, you are going to have a moment about the bolt taken by the relatively small angle bracket legs. A much better design would use u-sections and pass the bolt thru both walls. With those spacers you will still see quite a bit of bending in the bolt but that's probably unavoidable, assuming you need that much angle.