there are 12mm bore ones which are the 125 and 100mm diameter wheels, the 80mm diametert wheels are 8mm bore - the 80mm are the ones from BIL. i made some nuts up from some hex silver steel and pressed them into a newly drilled hole bigger that 12mm, so as long as you have suitable wall thickness, you could make some up for your diameter - contact me if you would like some made up. will add pic when i find it on phone
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