That's because Hohner does not use MS rivets anymore. All reedplates, MS or classic, are hand made nowadays, using the traditional method.Hohner USA doesn't sell MS rivets - I tried a few months ago. They just have - and will supply - the classic "sausage link" rivets - a wires of soft metal with the end of each rivet length marked with a pinch in the wire - just break one off from the end.
Winslow
Cheers, Fernando