Swift Coilover Springs. 65mm Inner Diameter, 203mm (8 inch tall) Free Length, 20kg (1120 lbs) Spring Rate. #Z65-203-200. Sold in Pairs. Made In Japan. Highest Quality Springs on the Market! Maintains the best spring rates under compression. Better Spring Memory and Lighter than other comparable springs. #Z65-203-200. Other Spring sizes and rates available upon request. Please call for more information.