Bumpers, if you mean standard or the SR style then Ebay or a scrappies. The grill, guessing you mean the open kind, then R05_Micra makes them to your spec/colour for £45. As for the wings, they will have the be custom done by a bodyshop.
you on about them louvre things for the wings? Bodyshop, Grill = bodyshop or RO5, bumpers anywhere, look in the back of the autotrader and find a jap parts - they do em cheap