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It's unlikely that anyone makes the bracket, but from HD it's only ~$5; the rest of the hardware you can get elsewhere (Radio Shack, for example). My friend did this for his AM/FM and CB antennas. If you want the bracket only, your dealer's parts guy can do a kit breakdown on the HD antenna relocation kit to identify the part number for the bracket only.
I have a Classic so I don't have a cb. And I did the hidden antenna in my fairing and it works great. It even picked up suff when I was out west and there was nothing around.
I stuffed the radios antenna under the fairing (hidden) and the XM antenna routed to the top of the radio case (between the windshield and the casing) on my RG