This rubber mount goes on each side of the gearbox and keeps the gearbox torque from twisting by keeping it tight.  This mount tends to deteriorate due to the heat and normal wear and tear...

This is a brand new, new old stock second motion shaft. 1946-1955 (all models with standard transmission)

This is the gasket between the rear of the crankshaft and the center of the flywheel. 1945-1959 All models fitted with a automatic gearbox