Hi,
I believe you are looking for part number S2171-1. I replaced this back in June of 2009 on my 1973 G model. It appears the source I used may be gone now but I tracked down a few old emails and sent out an inquiry. I'll let you know in a day or two if a get any feedback.
I have attempted to attach a drawing of the rubber seal. This is what I used which appeared identical to what I replaced.
I'll keep you posted.
Ed
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