Red roll cage with logo for VW Golf IV type 1J — TA Technix

A roll bar does two unrelated things: protect in the event of a rollover and stiffen the body. On a convertible, which has lost its roof and a significant amount of rigidity, the difference is noticeable from the first bump - less shaking through the windscreen and a front axle that stays aligned with the rear.

These are style and stiffening roll bars, designed for road use and non-competitive track days. A timed competition under a license requires a roll bar approved by the relevant federation, with its certification sheet: this is not the same part.