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Post up a pic of it, someone will know where it came from. When John Canfield sees it he should know. You can also google the DOT number on the lens, that should tell you.
I found this post on the Winnie Owners Forum. "I have an 05 Horizon 40FD. The tail lights are 2001 Chev Silverado". If you google 2001 Chev Silverado tail lights, you get lots of images of different variations of tail lights for that vehicle.