I have only seen them for '94 on up mustangs but that does not mean that they do not exist. Try the site I listed earlier, it is nice and the people you talk to on the phone are helpful. They may be able to help you out. There are always the "universal" kits but after some research, I have been leaning away from them because they require major mods and are "universal." Most times something is universal, it doesn't fit perfect on anything, it just fits OK on everything....leaks, scratches, uneveness, etc.
i've seen a few 99+ with the doors. looks better on the 94-98 IMO