the SRT parts will fit.
The item to check for on your '12 R/T is whether you have Super Track Pack option - if you have (yellow) Bilstein shocks.
If you do, that gained the SRT rear springs, shocks (front & rear) and larger rear sway bar.
The other items (Brembo brakes) would require the SRT knuckles - if you go that route, your R/T Classic wheels won't clear the Brembo brakes - the offsets are different.
If you're changing out the sway bars - you'll need the appropriate bushings that go with those parts.