Take the chute deflector off. Go to a paint store that does colour matching. They can mix the correct colour for you.

However, places like Tractor Supply often carry colours for machinery. Check with them first.

Thanks castoff. The chute deflector is actually black plastic but perhaps I can find a different small and easily removable part.

i have a 90s yardman lawntractor that im in the midst of RE-painting. the original color match is krylon banner red spraypaint from walmart, it does a good job too