I am not positive, but I may have found it, unfortunately I cannot find any detailed pics of the part, but maybe you can find a local dealer that has the part, and for and see if they match before buying.
1993 Cadillac Fleetwood.
CLIP. RETAINER. Floor Console. Instrument Cluster. Instrument Panel. Instrument Panel Trim. Windshield Defroster. Bumper/Fascia. Door Lock Remote Control Inside. Driver Information Display. Front and Rear Bumper/Fascia Face. Front Door Trim. Instrument Panel Pad. Radio Antenna. Door Inside Assist Handle. Door Lock Inside Handle. Front Door Armrest. Radio Receiver.
Not sure if this link will work, but try it and see if it works for you.
INSTRUMENT PANEL PART 1. Fits: 1993 Cadillac Fleetwood | Nalley Buick GMC Brunswick
Number 31 in the pic is this clip, hopefully it is the right one.