Oil Seal Gasket Gearbox Drive Shaft 12755013 Manual Gearbox Driveshaft Oil Seal for Vauxhall / Opel Corsa D Cascada Astra J. OE number: 12755013. Prevents Lubricant Leakage: The gearbox drive shaft oil seal is crucial for preventing lubricant leaks at the gearbox drive shaft junction.