I've seen where people do image searches in google (never done it) and it will find like images to the one you search. Someone did that for mine (from irv2.com) and that's how I know what they're from.
I found this with a quick search for "how to do a google image search"
For future reference, Winnebago would be able to tell you that also.
I was searching for taillights for my ‘05 Horizon. They were able to tell me they were from a Chevy Silverado.
Who knew!