A lot of people that get that OEMAutoPartsCo bezel end up regretting it, some had issues with it (reports of it messing with the CanBus by some... @00R/T and others), and most decide they need the rest of the functions that the radio should have and do the full conversion within a few months anyway.
If you have an Ra2 radio with BT and mirror with mics already, you can always just add the steering wheel audio controls (@ $100) and squeeze the Ra4 behind the existing bezel to see if you like it without the extra controls.
DIY: 2013-2014 OEM Steering Wheel Audio Control Install
If you don't have a backup camera, we have a thread for that too...
Installing OEM Backup Camera (post 10)
Sent from my non-flammable Galaxy S7!