I recently purchased a used Citizen Nighthawk I would like to replace the crystal and Gasket. I can find a replacement crystal but I am having difficulty with the Gasket. It looks to be L shaped, does anyone know if that is true or was it just deformed when the crystal was pressed in? I can find I shaped gaskets that fit this case but it seems that L shaped gaskets do not come larger than about 36mm. The case opening is 38.8mm.