This steel spool fits 7.5″, 26 spline GM rear ends. Features heavy duty axle retainers that eliminate the use of c-clips. Reduces rotating and unsprung weight. NOTE: Axle C-clip groove must be machined to accept axle retainers. Customer must determine if they have thick or thin ring gear. 22545=7.9 lbs. / 25897=9.7 Lbs.