Stilo offer a range of adapters for using with their helmets and other electronics systems, and also their electronics systems with different helmets.AC0204.2 - Adapter to connect Stilo helmet to Peltor and ZeroNoise intercom amplifiers (Nexus 4 way male plug) and car radio systems, 32-55cm's long. See AC0220.2 below for alternative longer version.AC0206.2 - Adapter to connect Stilo helmet to car radio systems such as MRTC and Autotel. 32-55cm's long. See AC0217.2 below for alternative longer version.AC0212.2 - Adapter to connect Stilo helmet to car radio systems such as Road Racer (ISMA style). Approximately 55 cm's long.AC0213.2 - Adaptor to connect Stilo helmet to Nascar to connect the female communication port on a Stilo Helmet. 32-55cm's long.AC0217.2 - As AC0206.2, but approximately 52-85cm's long.AC0220.2 - As AC0204.2 but 52-85cm's long.AC0221 - Wired adaptor to connect earplugs with RCA male plug to Stilo helmet.AC0222 - Wired adaptor to connect 3.5mm earplug jack to Stilo hel