Get the vin off your trailer and call parts at Forest River.
They can look up what you have and will sell you a replacement.
At least that's how it worked for my 08 model. They didn't have the exact
color but the color was OK and like the old days with hub caps--
they don't have to match from side to side as long as they're close because
no one will ever notice unless you tell them.
Here's a sticky thread with Forest River phone numbers.