I see where you are coming from Vern and cant remember seeing an open top car sports or otherwise wearing an out and out roll bar other than one that has been added cosmetically,they get thinly disguised behind the headrests of the seat's as roll hoops and work in conjuntion with the airbags system.
The only exception that comes to mind is the Boxster and that has a complete bar that is bolted to the floor but again covers the headrests.
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