the non turbos (usdm z31) only had 4 lugs in 84 and 85. after that they all had 5 lug, turbo and non-t. and (again, usdm z31) front calipers were 1 pot till 87, then 2 pot. this may help. i don`t think there was that much difference between the usdm and jdm z31, as far as suspension goes.
i heard (from z31.com) there was a bunch of s30 and s130 going to sezs5 and i should contact you guys on times and places for convoys. any of you guys going?