I know this is an old thread - the email address above doesn't work. I looked around and was able to find that Napa part number 269-1577 (power steering / cv boot) is a great fit to replace a Satoh shifter boot. It took some elbow grease and a little prying for the bottom seal, but once on its a very durable water tight seal. Below are an image of the end of the box from napa for reference and a picture of how it looks on my Satoh S650-G. These forums are the absolute best source for information on satoh tractors, Satoh owners, please use and post to them!
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