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AlexD
Different threads, depending on the wall thickness of the axle. Can't remember the actual numbers but 6600/6650 is the normal road size so any generation 105/Ultegra/DA compatible parts will work. Look in my 464 thread for #tester_approved aluminium ones
https://www.ebay.co.uk/itm/CNC-Machined-Anodized-Arm-Fixing-Bolt-for-Shimano-Hollowtech-Crank-Chainset/330831859440