Ok its not in my MSP binder I got, so Im still looking for the Diag. SO going from memory, there is a 3 bolt gasket from the S pipe to the J pipe, the J pipe is conneted to the Cat pipe via a ball and socket flange (no gasket) the Cat pipe is connected to the mid pipe via a 2 bolt flange and gasket, the mid pipe is connected to the axle back via a 2 bolt flange and 2 bolt gasket.
So in total from the S pipe back you have 3 gaskets, 2 are 2 bolt and 1 is 3 bolt. I dont remember the hole diameter or the offset of the bolt holes. Hope that helps a bit.