First time I've seen one with a shoulder like that. Looks like a decent one though. Are you saying that the round part wouldn't go in the hole? Or was it just too short to reach and bottomed out on the shoulder?
Not sure which one you have in Maryland, but CSK (Checker, Schucks, Kragen) has the Powerbuilt one that is straight with no shoulder. Now that they're owned by O'reilley's though, not sure if the stores in your area still use the same tools. Kragen stores do out here.
Paul