A 1 5/8 socket works however a bit loose but this is what I have used for almost 10 years. The 39mm will be better but one tip since that nut is so thin, if you notice the end of the socket is slightly beveled so as to make it easier to inert on the nut. That bevel will not allow for the socket to securely contact the entire thickness of the nut. Dress the end of the socket on a grinder to make a sharp flat so as to contact the entire thickness of the nut.
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