Being of economy size, I have snapped a few bolt sin my lifetime, Think OEM is 10mm, I went and drilled them out fro 12mm and went with longer thread grade 10.9 chromed Allen bolts  ( i use anti seize with  lock washers , I check the bolts now and then to see if they are bending, that grade 10.9 is strong chit, plus with threading it longer you get a better bite. ( you will have to drill the pegs holes to 12mm also.