Are there any “true” roll bars available that are double hooped like the style bars?
Up until recently the answer was no. There are now two bars available. Check out the Hard Dog Deuce and the Boss Fog Double Hoop Roll Bar. But beware, there is one style bar on the market that looks like a real roll bar but it isn’t. What it has is diagonal bracing coming off the top of the hoops that go to flat plates right over the gas tank. I’d hate to be in a Miata equipped with one of these in a roll over because you would probably end up with two holes punched in your gas tank. The last place I’d ever want to be is upside down in a car with gasoline pouring over me.