I think you may be in for an adventure trying to swap the entire bumper, grill, headlights, etc. And who knows if all the electrical connections will work.
Just get a mesh grill from here:
http://www.ebay.com/itm/SPORT-MESH-...-/400593338599?fits=Make:Land+Rover|Model:LR3
Get the Land Rover green oval grill decal from Atlantic British.
If you don't have an HSE with xenon headlights, you can probably get a used set of LR3 xenon headlights from Roverland Parts.
Just get a mesh grill from here:
http://www.ebay.com/itm/SPORT-MESH-...-/400593338599?fits=Make:Land+Rover|Model:LR3
Get the Land Rover green oval grill decal from Atlantic British.
If you don't have an HSE with xenon headlights, you can probably get a used set of LR3 xenon headlights from Roverland Parts.