Magnum head valve keepers

I managed to lose 1 keeper and now I have to find a replacement. I do not know where to begin. All the images from O'Reielly, Autozone... etc show many different pics. The one I need is a simple one groove. I don't know if the are 7 degree or whatever... Anyone can point me into the right direction? I just need one dang keeper for my '97 Magnum 5.2/5.9 head.... I'm ticked....