I transferred my Extang Solid Fold 2.0 from my 2018 xlt supercrew to the 2021 PowerBoost XLT. there is a small difference in width on the beds. not noticeable with this cover as it sits on top of rails. I would imagine the low profile covers may have an issue.
My 2018 came with them. Dealer installed plates. I was on struggle bus with cleats for a bit. as earlier reply said - you need them flush before they go in right . my new 2021 did not include them. Ford has them as accessories at 2x price that Amazon wants for similar.