I'm currently in the process of replacing the head and cylinder gaskets on my motor. While removing the bolt for the cylinder cover the bolt broke. Greatfully I was able to get the left over bolt out. Since I have to replace that one I'm going to replace all of them. Question here is, are the bolts special (stainless, aluminum) anything like that or can I just goto the hardware store and get them. Also should I put thread lock or anything like that on the bolts when putting them back in? Any info would be helpful. Thank you.