The connectors between motor and ESC look like "normal" 4mm bullets to me. Had the same issues with my fan, after 3rd run or so one blade was missing. found a little stone inside the ESC which killed the fan.
Replaced it with a
Hobbywing Fan HW86080070 (was the only fan in stock at my LHS) Not exactly the same plug, but with a sharp knife an shrink tube around it worked like charm.