I'm pretty sure the Sc-c1 uses the same 10 pin patch cable as all other SXM tuners made since (I believe) 2005. Any new head unit that is SXM ready will have the 10 pin port on the back.
You can see the backs of potential headunits @ crutchfield.com. If your Sc-c1 has the 10 pin cable it should be plug and go.
If not, and it has the wicked old 8 pin style, I believe PAC ( PAC-audio.com) makes a patch cable to convert from the 8 to the 10 pin. If that's not available, your next best bet would be the use of an isimple gateway.