bought my from ebay, something like this http://cgi.ebay.com/ebaymotors/BOLT-M8-NYLON-PUSH-RIVETS-10-PACK-HONDA-YAMAHA-SUZUKI-/300584641245?pt=Motorcycles_Parts_Accessories&hash=item45fc3da2dd#ht_1105wt_754. However, NAPA might have it - at least, they have a lot more of these fasteners than autozone.