17.With the axleshafts in, we bolted the Dynatrac spindles on and installed the hubs and new disc brake rotors that we ordered new from our local parts store (along with loaded calipers). The real son-of-a-gun in this axle build was the caliper brackets. Every single other part of this axle build could be gotten new. But no one make aftermarket caliper brackets, so all you can do is search for used ones. We found ours through Parts Mike. They were rustier and cost more than we wanted (hey, they were used!), but Parts Mike was still selling them cheaper than a lot of other parts shops.