I have a 2001 200L EFI Serial#OT324413, I have a oil leak coming from a brass type gasket that bolts to the oil pump. The hose comes directly out of the reservoir and runs to the pump where it has a fitting that a bolt runs through and has a small flat washer, that looks brass? It leaked out all of the oil as it set through the winter. I took it out flipped it over and it still leaks. I tried to find just the washer but the parts breakdown just shows the whole pump assembly. Can I buy just the washer?