I have a couple questions about these parts leftover in my gasket sets... First, what is that 3-hole gasket for? http://www.engr.uconn.edu/~ameer/head.jpg Next, what is that white plastic thing near the rear crank seal? http://www.engr.uconn.edu/~ameer/crankcase.jpg I just hope I dont' have to go back and put those somewhere. TIA. -Ameer