A gasket is a shaped sheet often made from rubber, paper or cork. Its role is to fill a space between two parts and act as a seal, thus preventing leakage into or from the parts when under compression.
A bush, usually made from rubber or polyurethane, dampens vibration and noise as well as allowing for flex. It absorbs impact, preventing damage to the vehicle’s components
The role of the oil seal is to prevent fluid leakage. It is always recommended to replace seals when worn, perished or when assembly replacements take place.