These will fit: https://www.wiggle.co.uk/shimano-105-fc5750-10-speed-compact-chainrings
You could probably find cheaper options at somewhere like Spa Cycles but the Shimano ones will make it look closer to original.
Pretty sure 5 is the o-ring which is usually wedged into the groove on the NDS crank already.
@spj7 started
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These will fit: https://www.wiggle.co.uk/shimano-105-fc5750-10-speed-compact-chainrings
You could probably find cheaper options at somewhere like Spa Cycles but the Shimano ones will make it look closer to original.
Pretty sure 5 is the o-ring which is usually wedged into the groove on the NDS crank already.