They are the same I have a 89sc and a 91 sc and a 93 lx and they all interchange look up your part # at auto zone and cross ref. It has helped me out in the past good luck.
Spike - to answer your original question, they are the same on all '92 T/bird models @ 10.86" diameter. Advanced Auto has some nice cheap replacements for about $23ea. called "Wearever".