Here you go....
Ordered a custom set of these seat covers a few years ago for our E-450 Class C and now use them in our F-550 Super C.
There are numerous colors and designs as well as other options available. I added the heated seat option, which my wife loves, and a rear pocket for maps, etc. They protect the stock seats, are easy to clean, and add some comfort.
The quality is excellent and I would highly recommend them.