I have run 5mm spacers (w/ extended bolts) for a while and I have not had any troubles. But not to say the next person will work out the same.
Honestly I would suggest maybe doing 10mm spacers all around, this would give you a more flush looked with those TIRE sizes. With that tire size in the rear + the +10mm spacer you might need a LITTLE extra negative camber. maybe like .5 of a degree and you should be good
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