One new Elring of Germany brand rear axle oil seal, part number S5031 (35x55x12/16) or factory # 000.997.13.46.  This fits:

Mercedes Benz 220a 1954 - 1956
Mercedes Benz 220S 1956 - 1959
Mercedes Benz 220SE 1958 - 1960
Mercedes Benz 219 (rear axle pinion seal) 1956 - 1959
Mercedes Benz 190 (pinion seal) 1956 - 1959
Mercedes Benz 180 (pinion seal) 1954 - 1963