Ring and Pinion Question

I just supposedly bought a set of motive 4.10's for a 97 camaro and I want to be sure I got what I was supposed to get. The ring gear has 41 teeth and the pinion has 10 teeth and they mesh together well. Are there any identifying marks on these that I can look for? The ring has 6-087 USA D2 stamped on it and the pinion has P-087 USA C2 stamped on it. Any help would be greatly appreciated.

Thanks,

Dennis