if your using wheel spacers use the proper ones......
there are cheap ones which are not balanced and the car wont drive properly!
theses may look like this

see how they dont line up properly and also they dont sit on the hub so you get run out problems!
the proper ones look like this

see how the holes are evenly drilled! and the proper ones sit nice on the hub!
if you use the ''cheap'' ones ie universal then you may aswell pull all the balancing weights off your wheel because thats exactly what your will get by using cheap spacers..... runout and loads of vibration problems!!
i didnt know about the spacer things as a bloke give us some for the wheels a mechanic told us and we took the spacers back for the bloke to say they were safe!!!!! after 10 seconds of us saying there unsafe the bloke said i dont need the greif you can have a refund! so he had the alloys back aswell!!!!!!!!
you may already know this spacer thing but most people dont!
abit of info for you!!!!!!