This should be posted in the MKIII section. I'll move it.
As for spoilers, this thread has many of the available wings and spoilers pictured in it... Take a look and see if what you're looking for is there a
and if so post back here with the name and we'll see if we can find a vendor.
http://www.toyota-supra.info/forums/...-spoilers.html
If you're looking for a hatch visor, there's someone over at SupraMania who makes and sells them. I think his name there is KeithH.
If you're looking for one of the air diffusers which mounts to the roof before the read window as seen on Evo's, no such thing for the MKIII as far as I know.