I switched mine out with new ones. The part I received was the same thing that came off from the factory. I used a claw hammer and just pulled the old ones off, they come off quite easy, and flipped the hammer over and tapped the new ones on. The fix works quite well and despite how easy it seems that the caps will come off mine are still there after three weeks and some moderate off roading.
_________________________
04' SVT Focus, EAP, Pitch Black, ZX5