These particular leads are required when installing the iO Play or iO Talk into a vehicle with only two speakers. These are also required where a vehicle only has front speakers fitted such as the Renault Clio, most vans including the latest VW vans. If an SOT lead is required to convert from the Vehicles connections to ISO, this will still be required.
PLEASE NOTE, THIS LEAD HAS NOW CHANGED. It no longer forms part of the ISO connections, but now plugs inline with the Orange Box and the iO_Connect or iO_Play loom, see "Back" image below.