I think all the Mustangs exported out of North America are missing those bits and I was initially disappointed too but once you get behind the wheel the other 99.9% that is there, makes them all totally inconsequential.
And don't get me started about those fanatics who keep whingeing about the handbrake being on the wrong side?????
But Steeda Europe can provide you with a great strut tower brace (and a LOT more) for reasonable prices all inside Europe, so no imports to worry about.....