I ordered up one from Ford. I found one on ebay that said it was from another manufacturer for $100 less but since it didn't say where it was made I assume it's just cheap Chinese crap. Tried that once many years ago with a mirror and it didn't fit right.
https://ford.oempartsonline.com/
I have a 2016 F150 Lariat and love the 4A, really miss it in the 2020 Ranger. Lots of times going down the highway here in western Montana when you get into slippery conditions at highway speeds. Don't worry about it in the F150. Same for going down the logging roads in the winter. Put it in 4A...