Swift Coilover Springs. 65mm Inner Diameter, 152mm (6 inch tall) Free Length, 15kg (840 lbs) Spring Rate. #Z65-152-150. 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. Z65-152-150. Other Spring sizes and rates available upon request. Please call for more information. Images may not be actual fitment.