z-bar help?

[Project RTS]

I have recently got a hold of a couple Z-bars for 67-76 A-body mopars. There are two different lenghts. I know the Z-bar for a big block was much shorter than that of the normal small block. Was there a different lenght for slant six or was it the same as the small block? if some one could give me the lenght of a small block z-bar i would be greatful. Thanks for the help.