Looking at Autopower's applications,
Autopower Industries - Application List , they list a different bar for targas and cabs.
The roll bar question can be very complex.
What is the purpose of the roll bar? Looks, street safety, a DE requirement, or racing?
Do you want to use your top? How do you want it to be mounted, bolt in or permanent?
It gets complicated. I spent months researching different manufactures, mounting locations, and different organization's safety requirements. Once I decided on what I wanted, it became evident that I was going to have to make a custom bar.
I used plastic tubing to mock up my design in my car. I brought my measurements to Autopower and had them bend tubing to my specs. I fitted and welded it myself.
Autopower and others will sell unwelded roll bars.
Good luck,