Yeh they are the ones
in going to use the 2 on the corner but use an adapter cause they are 16 mm threads
Toyota uses glue on those grub screws so a little elbow grease is going to be needed to remove yours if you want to. Also going to confirm that the thread also is a reducing ( tapered thread ) diameter.
DAM salt on those Jap cars !!!!!!!!!!!!!
PS you will never get rid of it. After polishing 5 days later and its white again and powdery
Do what Rogue did and paint it after you clean it up.