Original gasket between right and left engine block.
When installing a new gasket, it is extremely important that the gasket surface is free of notches, scratches and free of gasket residue from any liquid or old gasket, so that you do not risk the new gasket being unable to close tightly.
Often and often you will not be able to replace the engine gasket with e.g. liquid gasket since the gasket also acts as a spacer between the two halves which together make up the engine block.
We do not recommend re-using the engine gasket as the risk of leaks increases.