I bought a project bobcat 743. The engine was removed and completely disassembled. My question is about the engine oil pump install. Is there supposed to be a gasket between the oil pump halves? I see that there is one between the pump and block, but cant tell in the service manual if gasket between the pump halves. Another question . The engine gasket set comes with 3 different front cover gear case gaskets. There is no signs of old gasket to compare to. How do I know which front cover gasket to use?