I have a couple of worn (cosmetically) radio controls ("source" button is toast) ----- do these just pop off and on or is this something that the entire car is built around?

2012 XKR coupe - Bowers & Wilkins - black buttons

Steve

 

Yes they are "easy" to replace, but you'll need a replacement and like all brands, the buttons are not available separately so you'll need a new faceplate anyway.