I got the alpine kc-sc100 and I dont have the cord that goes from the sirius radio to it. What do I need?

The KC-SC100 is an adaptor to hook up my sirius to my alpine headunit. I need to know which cord i need to buy for my sportster to hook up to the adaptor. Thought that it came with the product but does not. Or do I need to buy another device to hook up to it.