Top one is the 8.875 10 bolt. Junk. No parts available other than maybe a stray bearing or seal. Plus it will only fit the B/C/D-Body full size cars. Bottom one is 7.5 non posi and it looks like it's the 2.29 ratio. Well it will bolt in to any G-Body.
Thanks turbofish38 trying to learn how i.d. some of the stuff i saw while looking for some bucket seats for my Regal. For now I will stick with 7.5 I have.