Oh I see, okay but I doubt the Italian shockers you've bought are initially made for the Belta or are they? Pictures would help alot.
Are you talking about the multi-spoke OEM Enkei 14'' rims or the five fat spoke pattern 15''s?
Ah, that's sad! I'd suggest you get the rear bumper crack repaired and re-painted afterwards. Same goes for the front bumper, if you just paint the area where the damaged has taken place you'd start to see a difference shade of white after a couple of days. Re-paint both the bumpers from a well-known car paint shop which you know can do good quality paint-jobs and you can rely on them, you'll be completely satisfied afterwards