rear subframe mounts? place called the specialty shop is making some replacement rear subframe bushings out of aluminum. i understand the rear suspension is similar. it would be sweet if you could use them, or would it make the rear end too tight? they are also making other solid mounts (diff/trans/motor) you might be able to adapt some for s13 use.
check em here
http://www.thespecshop.com/z31.asp