what all do i need, i looked at some of the howto's and thats a different stock head unit then the 09 ss. what are all the adapters i will need? like stearing wheel controls, and antenna obviously, is there anything else? do i need this at all

Scosche GM13SR GM/ LAN Stereo Replacement Interface Module for

 

I just got a dash kit, antenna adaptor, and the scosche door chime/interface piece and said EFF the steering wheel controls, but that's just me

 

steering wheel controls are nice, even though i hardly use em, still nice. getting that, backup cam and some ebrake thing from amazon for 60 bucks. pretty good deal

 

I got that in the link at best buy for $80 and it worked fine but my steering wheel controls don't work anymore