I been looking for an antenna adapter for my R56. I can find one for the R53 but no one seems to list one for the R56. Are these two compatible with each other? In others words has the antenna connection on the radio head unit changed from the R53 to the R56? If so does anyone know where I can find the proper adapter?

I would like to use a FM modulator to possibly incorporate a HD/Sirius set up. I have the aux port which works fine but I normally keep sirius on ESPN and I hate listening to commercials. This way I can switch to off-air radio then fast forward though the commercials and switch back to sirius using the MFSW. This setup would also allow me to hookup an off-the-shelf HD radio receiver into the adaptor and leave the aux port for my ipod or other gadgets.

Any help would be great
Thanks