Long story short, i recently purchased, what was advertised as, a Limited slip differential that is compatible with a 2008 Nissan 350z. Turns out, not only is it not a limited slip, the flange that connects to the axle is no where near the same as the 350z's. i got a few images back from "G37 differential" and it kinda looks the same.

here is the diff i received:

 

another pic

 

just found out it's apparently from a 07+ automatic G35

 

Isn't the final drive the same?