Aftermarket Stereo

Can anyone help me with what I am goin to need in order to install an aftermarket stereo with my '05 TB having ONSTAR and the STEERING WHEEL controls? And will all still function with an aftermarket stereo?

I dont know of any a/m head unit that will directly interface with steering wheel controls.

Joel

i think crutchfield has some stuff that will allow u to use the steering wheel controls... check it out http://www.crutchfield.com ... just put in ur car make, model, and year and they tell u wat works and wat doesnt