The wavy retaining ring that goes on the front clutch pack is thinner than the rear drum retainer but it takes up more room . It is MEASURED from the top pressure plate to the top inside of the snap ring at its highest point. You can install a rear clutch lower plate on the top of the front clutch to gain one extra plate. You have to twist the retainer to install it. I use .061 red eagle smooths in the front clutch to install even one more.