To widen your search just a little bit, the seats in a Cobra are no different from any other 93 Mustang. As I'm sure you know though, Opal Gray is a 93 only color.
Actually the 93 Cobra seats are "sport seats" they do not have the adj bolster and they have plastic backs to save weight.
Just recover the seats! If you are in need of new interior latemodelresto.com has the set. I just bought a cloth set to put in a customers 93 Cobra since his drivers seat was damaged.
Install isnt bad, I did my seats in my old 67 before and they were harder. Once you get the hog rings pliers down its easy, slips on..warm covers help to make the vinyl sides softer. They actually give you a list of a few tricks in the instructions.
I think I'm going to go to the shop today to work for a few hours Ill grab some pics. Ill have my 19 month old helper, she is daddy's girl. Was up under my truck last night helping my put end links on, I looked over and she had pulled a wrench out and was ready to help..lol MMFF wont shoot the car till the factory seats are back in we figure lets recover them and make it all perfect.
On a side note....You still have the results from the muffler test you did? Can I get a copy?