The actuator arm bolt is a splinned cam as part of the brake-plate assembly. The end of the arm attaches to the actuator rod with a simple pin centered by the rod and adjusted with a spring and cam-type nut. The rod then connects to the pivot near the swing-arm pivot. Do you mean the shouldered bolt with a flat head that holds the brake-stabilizer bar to the brake-plate?...........If so, that same bolt was used on thousands of bikes and numerous models.......it may be available from HONDA.