I have a 99 SE Sport and keyless entry was optional. IIRC, the module is white and under the passenger-side kick panel (under the PCM, which is grey/silver).

1999 Contour SE Sport MTX75 T-Red/Grey
Audio: Pioneer DEH-7400MP (MP3 CD), Pioneer TS-A6857 front & rear, PPI PCX-250, Infinity Perfect 10.1
Other: cup holders, cargo net, Blizzaks, Potenza RE950s