I think the insert is B4010 for this type of dropouts. Two different finishes black anodised or silver.
https://www.paragonmachineworks.com/dr4010-rohloff-iso-mount-for-10-mm-skewer-2618.html
However double check either with Soma or Paragon Machine Works before you buy. Perhaps try to see if you can source it directly from UK supplier like Ceeway.
@Greasy_Paws started
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I think the insert is B4010 for this type of dropouts. Two different finishes black anodised or silver.
https://www.paragonmachineworks.com/dr4010-rohloff-iso-mount-for-10-mm-skewer-2618.html
However double check either with Soma or Paragon Machine Works before you buy. Perhaps try to see if you can source it directly from UK supplier like Ceeway.