Have you done this, or know that it can be done? I asked a Ford parts dealer about this, and he said that the license plate part is integrated into the whole rear reflector combo-thingy.

'98 Mystique Zetec w/ auto trans 103,900 miles Kenwood KDC-MPV7017 CD/MP3 HU Kenwood KFC-6889ie 6x8" 3-way speakers '96 Mystique Zetec ATX 108,000 miles