The Beneteau Spare parts site lists the anode as "ANODE ZINC NUT D25 W/SCREW", so presumably 25mm. Our 37 has a 25mm shaft so I can't image the 321 would be larger.
I have the B323. If the shaft zinc, is probably 25mm, 1 inch. Also/probably, you need the thinner zincs that Beneteaus are known to need . BD-25 at http://www.boatzincs.com/beneteau-collar.html
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