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According to the parts number found in your C2G7 owners/parts manual page 7. These parts are still available at http://www.marineengine.com. At marineengine.com you have to put a 0 before each part number when you do a search.
ex 0550861 for shear pin Please verify the number with your parts manual.
550861 Propeller shear pin
550108 Gear Housing Gasket
550040 Water pump rotor
If they used JB Weld on the outside of the gear housing cap cover assembly to seal it, then you will have carefully separate it from the gear case. You don’t want to damage the mating surfaces. If someone has modified it this way, then pay close attention to inside to make sure parts are not missing. In this hobby, never assume the previous owner did the repairs correctly.
Over the years, some grease comes in contact with the rotors and they swell up. When they swell up, they do not leave room for gaps in the housing so water can not be gulped up and pushed forward to the water tube by the Rotor.
The rotor from marineengine.com is a little expensive.
Bob Long, AOMCI makes rotors and impellers for hard to find applications. He is reasonable with his pricing. I just purchased an impeller from him for my 1949 Elgin 5hp that I am slowly tackling.
http://home.earthlink.net/~flyingscott/
Just giving you options.
Cajuncook1
My experience with this type of lower unit is limited to one motor that is a 1957 Seaking 3hp. It has the rotor type impeller.
Frank Robb and Garry Spencer are great resources for these motors. Hopefully they will see your post and chime in.