A good idea would be too look for the part number for the flange gasket that goes between the 4-2 and 2-1 sections for the beams motor, and then cross reference it to other motors to see if they use the same part?
fakeedit: Oh, they use those little ring gaskets dont they. Nevermind
In other news, wasnt it concluded that a gen 3 3SGE B pipe fits up properly to the beams 4-2 section?