My friend has an 81 (I believe) 5 horse mariner outboard model number 6e3 serial number s110027. He is looking to replace the prop with basically the same one it came with as it is old and the edges are getting fairly boogered up but he is having problems finding it. It is a 3 blade prop and the exhaust does not go thru it. Does anyone know where to find those props or even what the model number might be? Thanks in advance for any help you can provide.