Fixed the title for you.
96-00 Civic's have interchangeable body panels. In order to get the 99-00 front end onto your car, you'd need the 99-00 headlights, hood, front bumper, front upper grill, fenders, and radiator support. You CAN use your stock radiator support but you have to bend the tabs on each end. So it's just easier to use the 99-00 radiator support. All 99-00 have the same front end. The only difference is that the Si has the different upper grill and an optional front lip. And of course the Electron Blue Pearl paint choice.
For the rear end, all you'd need are the 99-00 tails and 99-00 rear bumper (hatch only works on hatch but sedan/coupe are interchangeable).