Spacer extension side bumpers 20mm

This extension fits in chrome tubes by 20mm (outer diameter) of the hull supports and acts as a spacer.
In the case of dry track and with added thickness, the fairing respects Cik-Fia prescriptions, in case of a wet track is sufficient to remove the thickness to indent the fairings of 20 mm so as to conform, even in that case, the CIK-FIA regulation.