If the Milodon 1pc gasket has the (2) side flat gaskets and (2) end black neoprene seals that fit into the oil pan half moon cutouts all connected & I am assuming that is what it is then that is it for an oil pan gasket (+ cement). If he was to replace the black neoprene rear main seals (2 halves) he'd pull the #5 main cap & one half goes in it then drop the crank a hair to R&R the other half that is up in the block groove.