I only not long ago replaced mine on my cj7. Used an eBay special to suit holden hz. Worked a treat, had to enlarge 2 holes on the mount and welded a different tab on shaft but yeah locks the wheels up if you stomp on it.
I couldnt fine one with the right length and tab push rod in Australia to suit mine setup which was a complete unit I got from the states years ago. Take the unit off your jeep and down to a brake place and I am sure they could fine something in their book to replace yours, I was quoted around $300+ for a replacement but needed to bring mine in, I used this holden one.