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4.8mm for Dynamo side, 2.8mm for light side.
These work great. If you have a SON Dynamo you need the 4.8mm connectors for the Dynamo connection. 2.8mm fits most front lights connectors for the rear dynamo. I have both the SON style dynamo connectors and the Shimano/SP style dynamo on various bikes. The SON is more robust, less likely to corrode out. The Shimano style seems more failure prone, but is easily repaired in the field as long as you have a spare connector and a knife or something to cut the wire and strip new leads.
1 review for SON uninsulated spade connectors female with an rating of 5 points.