If it's from a Micra built in 2000, it's most likely a <a href="http://upload.wikimedia.org/wikipedia/commons/6/69/Nissan_Micra_front_20081017.jpg">facelifted</a> model. To fit this kind of bumper to a <a href="http://farm4.static.flickr.com/3502/3247117599_6176c0126f.jpg">pre-facelifted</a> Micra, you would need to replace the front quarter-panels (you guys call them wings I think), the headlights, the bonnet and the front grill, amongst other things. It's not a simple swap-over unless you want to start hacking the bar up or swapping over all the bits from the later model K11.
i was affraid that it would be a bigger job than just a simple swap it looks like it would just replace the plastic one that i have now that is mostly held on by cable tise lol as only found out a couple of weeks after i bourght it and realised it had a small acciedent on the front drivers side and they didn't put the bumper on properly im still goin to have a look to see wht needs to be done jus to see homuch work is needed to be done