They advertise the Legacy/Liberty STI part to OB owners in Aus. For the ridiculous price of $1105.67AUD ($747.41USD)The 19mm RSB is an OEM Subaru part that looks like the original 16mm. I'd doubt if the mechanics even notice it has been changed.
Subaru doesn't make a front strut tower bar for the OB. An aftermarket piece will stand out like a sore thumb.
This. Just remove the strut tower brace before bringing the car in for service. Only takes a few minutes.IME they void the warranty but it depends who's behind the desk. However, it is about the easiest mod to remove if you need to bring it back to Subaru for work.