I am looking to purchase a 46* SM9 wedge. If I go through the selections on titleist.com, it gives me the option for the Project X 6.0 shaft. I would like to get some stamping on it so I went into WedgeWorks to customize the club and the Project X 6.0 shaft is not an option. There is the 5.0, 5.5, 6.5, and 7.0 but not the 6.0. Does anyone know why?