[Mr.ac]

Well... depends what you want them for.
If you need them for racing on the track you'll need a roll bar. Most track rules go by scca rules, and they want a roll bar with all harness. Depends on the track/organization.

If just for looks, then who cares? You'll quickly find out it's a bitch in traffic, and uncomfortable as fuck.

Unless you get retractable ones. Those are often used by the Jeep off roaders. You could look into that.