Are you talking about the fiberglass cover that attaches to the driver's footbox where the shaft exits? Or, are you looking for a steering shaft cover like what Sanford is suggesting?
If it is the former, probably your best bet is to put a "parts wanted" ad in the classifieds. My buddy got one that way from someone that had an extra. I am not aware of any vendor that sells them. Or, you could lay one up with some fiberglass cloth.
If it is the latter, I fabbed one up out of the donor steering shaft cover after I searched around and found several references to them here. Again, none available for sale that I could find. But, it was pretty easy to make.
Hope this helps!
One of the last Mark II's, FFR complete date 5/8/04, delivery date 5/23/04, donor-'93 Mustang GT. Yes, that is me in my Avatar. :)
New goal: 2012 now...FFR Open House, coast to coast, gel coat or paint, doesn't matter. Three thousand miles and change. Wife with me? Buddy with me? Solo? Dunno. Just gotta do it! Starting to plan... Need to tidy up wiring, finish e-brake relocation, reinstall roll bars, other do-dads...