a kit sold by Tom's Offraod, A site dedicated to Early Broncos.
They have an excellent install video here
At 2:28 of the video, they talk about bolting a bearing retainer on after bolting the caliper adapter on. My Bj kit says toss out the old bearing retainer, the bracket does the job. I'm puzzled and just want to make sure the retainer is not needed on my set up. To be honest I can't see how bolting the retainer on after the bracket would do anything useful.
I'm just trying to be thorough.