Watch this 1 hr video. It is very helpful. I followed the wiring setup in this video to add puddle lights, turn signal and running lights using the Ford mirrors mentioned earlier
This is the mirror set I bought. Price has gone down
https://www.fairwayfordparts.net/oem-parts/ford-2015-thru-2020-f150-trailer-tow-mirrors-pair-for-xl-and-xlt-jl3z17696ba?c=bD0zJm49RmVhdHVyZWQgUHJvZHVjdHMmaz0x
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The F150 tow mirrors are interchangeable from 2015-2020. As you stated the 2018-2020 F250 mirrors are the same. You have now confirmed 2021 will fit as well. I recently installed Ford tow mirrors on my 2015 F150. My first set were 1A Auto mirrors that were great but wobbled horribly...