WJ discs?

I am planning on going to rear discs on my XJ d44. I have been shopping around and found a feller that has a set of discs off of an al. D44 out of a 99 WJ that he is willing to sell to me for cheap. My question is, are tehy the same as the ZJ discs? Will it work to drill teh caliper bracket like you do on a ZJ bracket? Basically, will these work or are tehy different? I am looking for the least work intensive method. Thanks for any and all help.
josh

don't know about the caliper bracket, but I know WJs have a bigger bolt pattern than ZJ/XJs do (5x5" or 5x5.5" don't remember which for sure, but it's bigger)

It is 5 on 5" you would definately have to redrill rotors to 5 on 4.5" just like when you do the WJ discs and knuckles on the front (d30)

the retainers are different than the ZJ and the bolt pattern is 5x5 vs 5x4.5