Buy a brand new metal bolt and remove a bolt anywhere there is a factory bolt and metal, scratch away the paint, but just in bolt area (sand is best!), ground ( keep wire short) and replace with new metal bolt! if you want an easier way, try grounding studs on ebay
http://cgi.ebay.com/ebaymotors/Black-Power-Distribution-Block-Dual-1-4-Studs_W0QQitemZ330306622234QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item4ce7cf131a&_trksid=p4506.m20.l1116