Pantera Billet Aluminum Rear Upright. We manufacture our uprights from a solid block of 6061 T6 heat treated aluminum (7075 also available), have them polished, and then anodized to help prevent corrosion or oxidation. These are a heavy duty upgrade from stock and were designed to use the stock rear suspension components. Silicon bronze bushings are used for the rear lower shafts to prevent long term corrosion problems. Please call for additional information and pricing. PAN-100