If the picture is right it looks like the DR. Diff uses a threaded bolt rather than a splined stud. That would take up less real-estate at the outer edge. Looks like a decent price also.
I'm pretty sure the pics are just representative, and not necessarily exactly the only thing offered.
That said, you can pretty much get exactly what you want. Cass (Dr. Diff) will take the time to make sure you get what you need. Best customer service in the industry. My buying experience was perfect, and I've never heard a bad word about him. He should be your first place to go.
