These carbon fiber extensions attach to the HRP Pro Mounts. They require the mounts for installation and are useless without the mounts.
This is the Mi8 version designed to suit Schumacher Mi8 with Xtreme/Lens bodies. It includes 1 pair of extensions which will work for 1 body.
On consultation with RC Maker, we've determined that these extensions are ideal for the Xpress XQ11 and AT1 when using Zoo Racing's range of bodies - as the Xpress rear body posts are slightly wider apart than the Mi8.