I am getting ready to buy my cage so I can mount my harnesses safetly...but the question is
Can I use the Autopower Street Cage instead of the Autopower Street Sport with harness bar built in
I there a place to mount without the Street Sport cage

Street
http://www.good-win-racing.com/Mazda...t/61-0178.html
Street Sport
http://www.good-win-racing.com/Mazda...61-0178SS.html

 

I believe the street bar is thin wall and just so you have zomg looks.

 

I have the Street Sport. Without the harness bar (street bar) you will still need some horizontal mounting point that is both secure and provides the right angle for the shoulder belts.

 

The bottom bolt flanges are different - looks like they are just examples and not the real pic of what you will be getting.

 

The link I provided has photos of the type of bar he would get.