8.25 suregrip

Thanks everyone! Sorry for all the questions, I just don't really know anything about these rears. Wish it had a 8 3/4! I wonder if it would be cheaper and easier to just put the 9 1/4 rear in there? Its complete. I can get it for $200. That suregrip is $125 and I don't know if that is for the lower gears like 3.55's. I could tell in that last picture though the difference but cant tell by looking at the one I would be buying. The only experience I have with the rearends is with 8 3/4's so I would probably have this done. Thanks