These refueling kits are designed specifically for the Radium Engineering FCST. The FCST does not come standard with any of the parts in these kits. As described below, the Radium Engineering refueling kits come in a few different varieties.
20-0815-20 REFUELING KIT, DIRECT MOUNT, STANDARD FILL
This option works for vehicles that require a standard filler mounted directly on the fuel cell. The included fill neck and cap mounts directly to the Radium FCST.