There are not. It is one of my biggest pet peeves as a Suburban fan. Despite the fact that they are often the first part of the body to rust out, not a single damn company reproduces them. They also tend to rust out in the "rust free" areas of the country.
Recently, I went so far as to buy a pair or rust-free quarter panels with wheel houses from a seller in Washington. Then when I found out how much shipping was going to be (nearly as much as shipping a truck), I then bought a truck in Washington and had it shipped to OH with the Burb quarter panels in the bed of said truck. It ain't easy, or cheap, finding them, lol.
The other option is to just fab your own out of universal trailer fenders.