89 mirage turbo stuff is not a direct bolt on deal. Even if it was you would have th 4 x 114.3 bolt pattern on the rear and 4 x 100 on the front. You can make it work but you actually need rear hubs from a 92 mirage sedan. They look identical to the stock 4 x 100 rear hubs but they are a little larger and a 91-92 Galant VR-4 rear rotor will fit on them.
I actually make a 100% bolt on kit using rear rotors from a 2002 Mini Cooper S and 1g dsm rear calipers. I have about a dozen kits out there with no issues at all. Its the same setup that I will be putting on my 3g hatch here shortly. For pics and prices look at my sticky in the FS section: http://www.4g61t.org/forum/viewtopic.ph ... 58&start=0