help! looking to find bolt size

[bigred7785]

im looking to put pro tapers on a harley front end and just have one simple question. what size is the bolts for the risers on the protaper brand risers? EXAMPLE:
http://cgi.ebay.com/ebaymotors/OVERSIZE-1-1-8-HANDLEBAR-CLAMPS-MOUNTS-CR250-CR-250-_W0QQcmdZViewItemQQhashZitem563d8a0c5dQQitemZ370399644765QQptZMotorcyclesQ5fPartsQ5fAccessories

 

[teazer]

I want to say 8mm. I have a pair of those out in the shop but no idea where they are.