Not sure what you mean. If there is play in the rack most often it's the bushing at the passenger side end. That bushing is metal on the 84-87 Fieros and plastic on the 88's. Rodney Dickman sells a very nice replacement part.
As for the damper that is similar to a shock absorber that sits along the rack and only used 84-87.
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "