wheel studs wanted

well I got my first set from Napa, they are the correct 1/2 inch right handed threads but they won't work for me because my rear end is the spindle style 8.75 1965 plymouth B-body rear end. The inner hub is held onto the drum by the splines of the wheel studs and the Napa studs splines are not near long enough to attach the the hub to the drum, if you catch what I'm saying?