Early A Z-bar for 273 9.5" clutch

Yes sir, all I know is they are different. But what is the difference? Is it just the width? What should a 273 bar measure? Are the throws different?
Doesn't really matter what the difference is but they are. I see Brewer doesn't have them in stock right now. They find used ones and blast and rebuild to resell. So do you need the V8 one or the slant one?