Actually those TRZ arms are very good arms, they are for drag racing application, And the reason why those arms do not have the sway bar brackets is you have to use it with anti roll bar instead of stock style sway bar.
It will be a nice drag set up if you use those arms with nice anti roll bar.
Yes, those type of arms will "Hurt" the stock torque boxes, when you are installing a control arms it's good idea to get torque box reinforcements anyways.
If you must have the rear sway bar, you can weld the brackets to that control arms, most companies have those available if you contact them directly and they are cheap.
Good luck
