When considering discs for my D44 I thought about going with Crown Vic stuff because it was pretty much a bolt on but....the asymmetry of the caliper mounting just plain bugged me!
I could have flipped the one side but, then you have one e-brake cable above and one below and you'd have to remove the upside down one to bleed it, plus....I'm really into symmetry!
Went with Explorer stuff instead....a little more work (welded and redrilled XJ pattern on the brackets) but, well worth the extra effort.
I also used the Explorer flex lines and mounted it to a couple of bolts welded to the axle tubes for a pretty clean looking install (the Explorer line I found was way longer than the XJ line and allowed for extra droop).
Also, I've found that a .230" piece of schedule 40 pipe (can't remember the size) was a perfect spacer for the retainer plate.
Just split the spacer and a couple of tack welds after you stick it between the retainer plate and the bearing and you'r egood to go!
For the e-brake I modified a couple of passenger side Explorer cables and the stock XJ cables.
Don't forget to adress the proportioning valve....just swap Grand Cherokee guts (plunger, spring and end cap) to your XJ's valve, makes a noticeable difference
Hans