Technical I need to have my 324 Olds balancer rebuilt, which one do I send?

Like an idiot, when I had it off to replace the timing chain, I got it mixed up with my short pile of balancers. My motor is a 55. I ran this summer with the one in the Pic. Can anyone identify these 3 balancers? The two on the floor appear to be single and double groove of the same style? The one on the car looks alot different.