Automatic Transmission Extension Housing Seal by Timken®. Rear. Without Boot. Width: 0.5″. Outside Diameter: 2.445″. Housing Bore: 2.441″. Timken offers the right seal to keep your vehicle running optimally. Timken seals provide ultimate protection from contaminants and help retain lubricants and liquids, ensuring reliable vehicle operation and contributing to extending the service life of the part they protect.