They all look the same to me but they are clocked differently. All ZX turbos came with internal waste gate. 81-83 280zx and 84 300zx were oil cooled only.What are the numbers on the compressor and the turbine?
These guys sell 205-60-14 as low as $40 a piece! No sure how much it would cost to ship though!
http://www.onlinetires.com/user/vehicle/tires/allbrands.html