One more picture of the way the arm bolts to the upright. In this picture you can see the bolt hole with the threads. You will notice part of the hole has no threads. This is done so that when you have the right bolt part of the unthreaded shank of the bolt goes in there to align the caliper an hold it tight and to help to keep the bolts from shearing off. This bunch of picture should give you an idea of your install.
