I have a hanging brake/clutch pedal bracket with pedals and brake switch in my pile of used parts that came from my '82 CJ-8. The clutch pedal is easily removed, and the brake pedal will still remain connected. I think I still have a good manual brake master cylinder, somewhere in the pile, too. I just looked at the bracket, it has the brake switch, too. The part is basically the same between a later '76+ CJ and a YJ, just that the YJ has smaller pedal pads and provisions for a hydraulic clutch master cylinder. $25 plus shipping, and it's yours!
Automatic brake pedal pads on '76+ CJ's and YJ's are wider than the corresponding stick shift versions, the one I have has the CJ small pedal pad which is bigger than a YJ small pad.
The brake bracket bolts to the firewall, and the steering column bolts to the rear end near the dash, triangulating it.
A SJ (Grand Wagoneer) column will bolt in place of a CJ column, and usually has tilt and an auto trans column shift. The shifter detent and indicator can be swapped with Chevy parts for a 700R4. The end of the spline is the same as late CJ. Later versions have the wiper and dimmer switches in them.
Hope this helps!
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ASE Automotive Master tech, former Chrysler-Jeep Level 4 Mastertech, CA state EA smog license