Headed to CA next week, I may have to make the drive when I get back, they "should" fit. Thank you!!!

 

I can not confirm 2015-2020 running boards will fit 2021, but found a set on Facebook Market Place from a 2018 and asked for measurements.
What I measured on my 2021 STX CC were not the same measurements the guy give me. I asked for measurement from mounting stud front to
mounting stud rear...they were not the same!

I ended up finding a set removed from a new 2021 and added the third bracket since Ford installed the studs already!

 

Looks good, just ordered a set that look close off Real Truck yesterday. thanks all, wished I added them when I got the truck.