Don't know if this will help...I have a '68 (not '67) Z24 Sport Coupe that I bought almost new (Oct 1968) with the HD battery option (T60), no A/C. No such bracket; and my battery is reversed from the picture...terminals on the back side, with the positive side to the right.
I know the '68's could be different, but I wanted you to know what I have.