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@Emyr
Sheldon in OMG WRONG shocker!
104mm BCD 4-arm cranks can take 31t chainrings or 30T chainrings with an integrated M8x0.75 female thread.
edit: Respectful apologies for kicking him when he's [6 feet] down. I have no information on the availability of 31T and 30T "integrated chainrings prior to his departure from this mortal coil.