This small seal will stop the transmission fluid leak. easily replaced by removing the rear 13mm headed set screw in the rear tail cover. please remember that you will have to refill the transmission after removing the inner speedometer drive to replace this seal
Known as: o-ring 25,3-2,4 / o-ring / o-ring 25,3 -2,4 / o-ring 25,3 x 2,4

"Rubber O-ring Speedometer Drive Shaft 914 911"