i've got sirius sat radio.i dont listen to regular radio anymore.as for the caps,i could not find any that would fit my wheels so i bought the large size caps (2 1/2) from american muscle and modified my original caps by seperating the silver face from the plastic backing,than grinding the backing flat and as thin as i can.next i seperated the face of the new caps (they are held togeather by double sided foam tape)and using 3M molding tape to join them to the backing of my original caps.