[Steve Davis]

Use a small oil filter gasket. Get an equivalent to a Fram 3387A filter and remove the thick rubber gasket.
    It is almost an exact match.

The cross section of the Fram 3387A oil filter gasket is a little small and will require a shim to keep the drive from slipping. Check this thread, scroll to the bottom, I have listed filters that are a better option and will not require shimming.    http://philcoradio.com/phorum/showthread...ter+gasket 
Steve