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First what are you going to use your car for?? If you are getting into racing and or DEs check the Tech regs of that orginzation. That may be why there really is not a comercially avilbe roll bar. There is one that I know of but would not pass tech for road course.
One guy in Charrolett NC purchsed this popular comercially availbe roll bar but had to do extensive modifications and welding of cross and additional down bars, removal of swing out door bars, to get the system to pass tech for road circute DEs. And to have his top work too.
The main tech standard is the SCCA Solo I tech rules for DEs. NHRA has different rules and each drag strip sets things up slighlty different. So check with the orginization you wish to run with first.
and this may also be why most vert roll bars are custom made.