They are called "Rear Bumper Step Plate". Not sure how to call in Thai. I got mine last year here in the US around US$ 30.- (a pair) from Mazda Dealer.
Khun ManualMan, I'm fine. Thank you. How about yourself ? Talking about the trip. I'd just come back from Abu Dhabi for another business trip. Will share some picts.
Happy New Year to you and to all members of this Mazda Club.