Is this the correct replacement pinion?
 

Howdy, doing some differential work. Replacing the 3.23 with a 3.73 ring and pinion and the shaft looks different. I just want to make sure they sent me the right thing. 77 Trans Am 400/4speed Original 8.5" 10 bolt. Ordered from quick performance, doing a rebuild and yoke swap as well. Looking at pictures of different suppliers they all have one of these two shafts, and from what I know 10" 8.5s are typical across the board. Just double checking, thanks.

Attachment 667096
Attachment 667098