Most of the time u can reuse ur stock bolts but the prob is that sometimes they dont seal very well. If u go to the part store they sell the little rubber gaskets that og over the bolts. Just cut off the old one and put the new ones one. The new ones will be softer than the old ones. and the slip over the bolts. They are called the Grommets
WCS: you are talking about the CX DX head. they had the Acorn nuts. The VX and EX/SI had bolts. HIH.

the part u need is #20