Mirrors
As per 4.8.5 of the Technical Regulations, alternative mirrors may be used.
Details of the existing mirrors are below. There are many mirrors available on Amazon and similar sites that are universal and will fit the car well, and can be mounted in the original mounting location or to the roll bars.
The stock mirror and mount
Recommended replacements
Section titled “Recommended replacements”Some people prefer mounting these to the roll bar for a more secure, vibration-free fit. They may also stick on small convex mirrors for a wider field of view, which helps cover the blind spots created by the car’s wide rear bodywork.
Stock mirrors that fold in or vibrate
Section titled “Stock mirrors that fold in or vibrate”Stock mirrors that will not stay where you put them, fold back at speed, or shake too much to read are a known problem, and the fix is a tighter joint rather than a different mirror.
Tighten the mount and fit Nord-Lock wedge-locking washers at the fastener. A plain washer works loose again after a session or two, which is why the mirror that you tightened last weekend is folded back this weekend.
Owners who mount to the trident bars generally report the stock mirrors work well from there, so try tightening what you have before buying replacements.