Only issue you might come across is it sitting too far forward - the pre-facelift bumpers curve more at the bottom so the flat part starts further under. The
guide linked to is for the facelift bumper
I reckon you'd need to trim approx the equivalent of "the width of a roll of duct-tape" from the ends of the splitter to get it to sit properly.
Then just get some self tappers and away you go!