Paxton ball drive supercharger rear impeller shaft seal. This is the latest design seal that will prevent the leaks. I had a large quantity made and will offer them on ebay for a reduced price of 40.00 (usually 50.00)and free shipping in the U.S. You can use this seal with my new impeller shaft on the McCulloch VS-57 superchargers if you bore the impeller shaft hole to a .002 crush fit in back of case and install the new shaft and seal. Look at my other Paxton McCulloch rebuild parts for sale on ebay. Call for info Paradise Wheels Inc. 760-744-2400