Targeted at the open wheel modified racing market, this shock promotes better feel and improved grip. The smaller 1/2" (12.7mm) shaft displaces less oil when compressed, giving the shock an added advantage of less rod pressure gain, thus improving driver feel. • IMCA Legal gas pressure shock. • Performance at its best on fast or rough tracks. • Bodies grooved for coil-over applications. • Available in 5/8” shaft upon request. How to read and specify your part number: The first two digits are the shock series (example: 73), the third digit is the stroke length (example: 9), the fourth digit is the compression range (example: 3), the final digit is the rebound range (example: 5). Questions? Contact us at 800-632-2320.