Radium Engineering Fuel/Brake Line Retainer Kit Fits Toyota Supra JZA80. Go Race Parts Presents.. Our Special on Radium Engineering Performance Products! This listing is for Radium Engineering Fuel/Brake Line Retainer Kit Fits Toyota Supra JZA80. Since 2010, Radium Engineering’s goal has been to simply design and produce high quality aftermarket automotive performance products. Radium Engineering relies on a core team with a passion for innovation to lead the company toward advancement in the industry. CNC machined and anodized. Uses OEM mounting studs and hardware. We pride ourselves in offering the best pricing and customer service on the internet!