Just a suggestion, I bit the bullet and had a very nice set made that fit perfectly by a company in Florida B-Smooth interiors in Pompano. This guy does custom interiors on high end vehicles. I guess you pay for what you get. Had a small amount of cushioning also sewn in with a sport pattern when viewed from the front. I'm sure you could have a full cover in the back, but I chose to use a cap that fits on the very top of the seat revealing the carbon backs for all to see. I believe Stormcat has pictures taken when I visited his shop. I'm sure if you ask nicely he would send them to you.
Blue
Here's a picture of Blue's Custom made seat covers. They fit very nice !! If you PM him he can get you the number for the guy in Pompano who made them. He also had a custom sun screen made..