just finished a batch of replacment parts for water pumps.
I have availible the pump packing nut and it fits the models M M2 M4 40 R 55 60.
Also availible the water pump cover which is usually very thin and corroded. I have these in stainless steel. They fir the models M M2 M4 40.
The price for the nut is US $ 17.75 and the price for the stainless cover is US $ 21.50.
I can send pictures website coming soon!