I have a 2004. I disassembled the top end to install a new piston and rings. When I took the head off, I turned it upside down to look at the valves and three of the buckets and shims fell out and I don't know their original location. Two intakes and one exhaust fell out. I have two 181 shims and a 188, a 190, and a 192. I think that one of the 181 shims was an exhaust. What should I do?