you asked about inner fenders and they are the same all regals
i think you mean the plastic wheel houses , 84-87 turbo (hotair and intercooled ) wheel houses are the same and different than non turbo cars.
if you aren't running the stock air box the non turbo (NA -naturally aspirated) driver side wheel houses will work just fine and should be able to get a little cheaper than the rarer turbo ones that have the "TURBO" cast into them by the air box indentation . the passenger side non turbo wheelhouse only differs by the raised pods between the ac box and coolant resevior (the pods hold a map sensor) and i've run across quite a few Gns and TRs with NA passenger wheelhouses ..most would never know the difference