Years ago mine was damaged by a tire blow, it was too expensive to ship. I went to local metal shop and bought a piece of scrap for $20.00.
mine was white so you have that problem but you might find some matching paint and mine was smaller area than yours seems to be.
just thinking.....what about these places that do seamless gutters or metal roofs?
I also found out the circular bend was exactly the size of a 2 liter soda bottle.