s13 cusco s21 cage differences?

[iwishiwas-all*]

Hey all, I have a cusco 5 point cage for a s13 hatch and im gonna be putting it in but my buddy has a coupe with a 7 point and he wants to trade, as long as we can make it work. so my question is what are the differences?

Height, mounting locations etc.... rear bars i thought would be the obvious difference, but to combat that i thought about switching my rear bars with his/

has anyone done this heard of this etc... the 7 point i believe is also sunroof compatible .

please i need help

thanks

[Otis Performance]

take some pictures