those with 6.5" lift or more

[Lowrange2]

This is about all I'm seeing.

http://www.tsmmfg.com/Pinion_Mounted_Parking_Brakes.htm

That just wouldn't work for anything offroad.

I've seen them that bolt to the tcase pinion.

 

[jeepgeek2002]

http://www.4x4wire.com/jeep/tech/brakes/xjhoseext02/