I am in the process of doing Lekdown test,compression test and cleaning and readjusting floats/ carb. Anyone with Toomey exhaust I need a little help. Ok first the flange that bolts on to the head is there a gasket for that or a crush washer? Second the silencer to the flange anyone know what size o ring goes there and where I can get 1. This does not look good as whoever had it before seems to have forgot to put one in. Also where does this part go?