I'm faced with a pending head bolt repair on my '99 Deville Concours. I'm open to using either studs or inserts. From what I can tell, the kits available for purchase include the tools needed for the installation, and then you can also purchase additional studs or inserts and/or head bolts separately. If any of you have purchased one of the various kits and already completed your installation and would like to sell the tools from your kit, I would be interested in them so that I can just purchase the new studs/inserts/bolts separately.