Rear spoiler (V14). Bell rear spoilers are designed to help improve the helmet's overall aerodynamic performance. The HP7 F1 spoiler is designed specifically for the KC7- CMR and can be used on models based on this design, including RS7 Carbon, RS7, RS7 Kart and KC7 CMR . The spoiler is available in transparent and is attached with an aggressive double-sided adhesive. Bell spoilers can be custom painted, but Bell recommends using the adhesive to attach the spoiler to the hull.