Rear disc breaks

Im new to site and I have a 1998 zx2 and want to put disc breaks on the rear. I need a new spindle to mount the caliper on where can I get the spindle. I have the old hub with new bearings. I will get  rotars and calipers but can find a spindle.  Help

From my understanding you need to either find a junked S/R or a olrder escort gt. I'll see if I can dig up some more info.