Sent this to Martin via PM, but posting in case member in the future is looking for the info.
I basically replaced the CB unit in my FLTRU with the XM module. They use the same connector. Now if you use the XM and CB and you will NOT be intalling any other radio mudules you can use the "y" connector.
IN-STORE PURCHASE ONLY Contact dealer for pricing and availability.
Allows installation of XM® Satellite components on Ultra models. Does not provide connections for additional components.
Fits '06-later FLHTCU, FLHTK, FLTRU and FLHTCUTG models equipped with Advanced Audio Radio.
MSRP US $49.95
Right now I'm debating on how to connect my ipod. If I use the radio's outside aux input, then I am just getting the "Y" connector above to reinstall the CB radio. But if I get the Harley ipod module, I think it comes with all the necessary wiring harness and there is no need to get the "Y" harness.
Things get complicated if I choose the ipod module AND the CB radio. As there is a bracket to install a 3rd module and you definitely have to get the bigger wiring harness 70164-06.
I can see it now, wires are going to be all over inside the fairing.