DM - Those are the ones. Good find.
CP - I've not heard of anyone needing to replace them on the VX (other than for a body lift of course). I wouldn't worry about breaking them but if you want to order some for peace of mind, call Merlin. He should be able to set you up.
They can be pretty stubborn to break loose the first time but they are pretty hefty bolts. They really don't carry much of a load so although important, the original ones will outlast the rest of the VX (even with taking a hit on the NERF bar ... bar will crush before bolt is broken).
The only thing I didn't like about using the body mounts for NERF bar brackets is that it allows the bar to flex downward when you step on it.