I'm pretty sure the z-bar is the same for all the small block a bodies - at least the year I'm working with.
But the little bracket that attaches the ballstud to the bellhousing is unique to the OD tranny - I'm pretty sure. I saw it listed at Brewer's, but I figured I might be able to get a used one cheap rather than spend $35 or $40 bucks on a new one.