The spacer's for your rear,would just bring the wheel out to evenly match the front-you won't necessarily know how much; till you get your front tires in check.
Sizes close to oem would be 275,285/35(F/R) or 285,295/35's.....with car being heavier in front-it would make a more even fitment on wheel (F to R) with just a 10mm difference in section width & same profile/series of tire...+ would give you a slight rake.
If those are too tall to clear the front....could go 275,285/30's....285,295/30's or even 295,305/30's.
It's whatever float's your boat....
1st thing-get the front sized & fitted first,before purchasing a complete set...other's may chime in & help you with this.
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