Well, I have always bought stock replacement which consist of a new water pump, and gasket. I have always been able to use my original bolts. I have had customers come in my door telling me that they have snapped their bolts in the block...so that is a common problem lately. Be carefull not to do that. If your bolts are rusty or corroded, I would replace them for sure. Clean out the holes with WD40 or PB Blaster and compressed air. Also, use anti-seeze or grease when reinstalling them. Do a T-stat and gasket, and the two little hoses that connect to the pump while you're at it.