here is a link to what you guys need. they work well. i used them to mount my aux fuel filter to the frame to eliminate vibration once i put the lift pump on. they work well. and completely protect from grounding.
http://store.nutsandbolts.com/well-nut-threaded-inserts.html
http://store.nutsandbolts.com/well-nut-threaded-inserts.html