I have recently doing research on converting the rear brakes to z32 brakes. I have a S14, and there are couple ways to do it, ie, splice cables, R33 cables (ideal) and cable extenter (discontinued). Here is the mystery kit:
eBay Motors: S13 240SX E-BRAKE EXTENSION KIT W/ Z32 CALIPER (item 220279882327 end time Sep-17-08 10:07:18 PDT)
Please let me know what you guys think of this kit, and compares to R33 cable method?