The Gen assembly has no white nylon gasket.....nor do the MBW's. The metal compression ring that the bezel snaps onto is too big. That is why they use the nylon gasket. A gen crystal will not help. Advice: install the crystal with some GS crystal cement, install the white nylon gasket, install the compression ring, install the brass friction washer and then snap the bezel in place.
I wouldn't swim with it though.
Nice looking watch for the price.