I'm just copying and pasting this from another thread that I typed it in..
"This just confirmed all of the research I did while working. Put my head together with my favorite parts guy.
My 2021 ST with a build date of March in Chicago.
My ST was BUILT with subframe part number: MB5Z-5035D ... I will get under my ST and find the part number hopefully on the subframe to confirm but that is the part that was used in my specific build at the Chicago plant.
That MB5Z-5035D subframe is for the 3.3NA hybrid motor for the Limited.
The correct subframe that my VIN number is calling for is MB5Z-5035E which is for the 3.0 Ecoboost.. hence this receipt confirming that part number as the one they replaced your old one with.
I have a printout of the part numbers used in my build and have it highlited next to what Ford actually calls for these vehicles. Next step is sending it to Ford to see if they will swap it out without any failures in mine yet.
Will keep everyone updated!"
PM your VIN number and I can check to see which part number they used on yours.