Neil….. what bike? For my 1969 cb750 the parts book shows “#8 balls, Qty. 37”. Yours is probably the same. Translation: 8/32” balls (0.250” diameter) X 37. I visited my local Canadian Bearing store and they sold me a package of 100 for Cdn.$10.67. I still have about 60 somewhere. If you can’t find some locally let me know.