I have a early 2003 (January manufacture) Gulfstream Ultra Supream. (so possibly used left over 2002 parts) The headlight retainer ring fell apart and I needed a replacement. I did find it on internet after searching (1997 Lincoln town car headlight assembly). I wanted to confirm so called Gulfstream (leave message they will call back) was told they dont use ford headlights but a headlight supplier. They looked up the part number for me and what do you know 1997 Lincoln town car. Have your vin number and coach number handy for them they can tell you anything you want to know about your coach. They were very friendly.
Ps, you had to buy entire headlight assembly to get retainer ring from ford dealer or any parts store, so got "HELP" part off rack at auto part store(NAPA) for 4 bucks.