Hello Secondshift,
Yes, we are talking about the same thing, C shape with the little wheels.
I think the issue is that the one salvage yard I follow on the interweb calls everything a 'boom vang' that has a reefing claw attached to it. I think that is so they can differentiate between that and salvaged mainsheet tackle.
Thanks for touching base, I would hate to ask for one when I needed the other.
-Spot