I wouldn't get the plug in kit for that headunit. If you want good quality, get a separate receiver that they sell for the satellite radio.
something like this
or you can buy a nice double din headunit and get the plug in kit for that.
I had satellite radio with the plug in kit for my headunit and it ****ing sucked. the guy at bestbuy told me it wouldnt be very good and i said whatever and bought it anyway and it was a very bad idea lol.
You can pay for it monthly, 3 month intervals, or yearly. Yearly you'll get the better deal.
Either way you choose it will automatically continue charging you. I used a gift card the first time and then they sent me a bill for the next month
EDIT ok you can't get a plug in specifically for that headunit anyway lol