to put s13 coilovers on the rear you have to completely build a new turret, a differnt kind of coild over set up has been fitted to the rear by some one on club s12 where the coilover spring is fitted in the place where the orginal spring is but with new seats and the coilover shock fitted as the old one is, technically it is a coilover set up....
gas shocks for the s12 aren't that expensive, kyb do some for about £50 each if i remember
