Unfortunately, I have to concur. I mounted the brackets to my '69 with no modifications other than strengthening of the crack-prone bracket itself.
It does appear that the brackets are mounted backwards although it is possible that you had the incorrect brackets to start with as I can't tell from the photos.
Hopefully it works. If not, some companies such as Saner make pretty affordable custom bars that might be more cost effective than reworking the mounts. Of course, then you end up with a one-of piece that kind of sucks for any subsequent owners!
