The forum description has model years:
Jeep Grand Cherokee & Commander Forums [New Posts]
Forums for Grand Cherokees ZJ (1993 - 1998), WJ (1999-2004), WK (Since 05) and Commander XK ('05-Present)
If you have a 2002, it is a WJ.
You can do things the right way or the wrong way.
Or you can do it MY way...which is like the wrong way, only faster.