I ended up making my own and it wasn't too much work at all. I cut the rusted portion out, flattened it, made a wood template and then used some 16g steel to form the piece. A 4x6 sheet of 16g cost me 18$. Probably took a good hour to make.
I have no experience doing this type of work, and didn't run into any problems, so would definitely recommend it as a DIY.