There is no OEM front strut tower bar.
As for OEM rear bars, there is:
Rear lower tie bar (Mazda calls it a "Performance Rod): G311-28-671B
Rear upper strut bar (just the bar): G311-28-913A
Rear upper strut bar mounting plates: R G311-28-9Z0
You'll need bolts to attach the rear upper bar to the mounting plates - I don't have those numbers. (Maybe try a search?) These part numbers are all from my webpage.