Xr5 Bumper Swapped to LS/LT Focus? Is it possible?

[05ZETEC]

Currently own a 2005 Focus LS Zetec Trim, generally happy with the looks of the car except the rear bumper. I would like to buy an Xr5 or ST rear bumper, paint it and mount that to the rear of the car bu I am not sure if it is possible. I have seen one bloke do it on an identical base car to mine (Attached URL)

[URL="http://www.ozzytyres.com.au/gallery/ford-focus-hussla-027-gloss-black-11737/"]

Any info or advice appreciated, Thanks in advance.