coil spacers size

[Gmc310]

Just a shot in the dark here, Managed to lose an ignition coil spacer while bike was apart, would love to make a new one while at work today but forgot my measurements at home, Would anyone happen to have one handy and could measure? pretty sure it's a 6mm bolt, I'm thinking 1/2 diameter with a .250 through hole and I want to say .625 long but I can't be sure, Any help is appreciated, Thanks,