The brackets won't help much. You still gotta build mounts for them and with the seat hard mounted to the cage you can't adjust the seat angle once installed.
I used angle iron to build the mouts.
Only my driver seat uses the brackets as it was installed first.
I try and get a pic later for ya.
Thank you. I was going to use the Kirkey mounts to attach the seats and then fab up some kind of bracket to mount them to the car. Thank you for the reply & pics would be great!