big spacers will help make it look properly but because your stock arches don't stick beyond your wheels, the wheels have no room to travel for your suspension. Hit a bump and your tyres will scrape your inside (stock arches.)
I'm afraid trimming back your arches are the only way but there's no return once done.
Also if you're doing to do it, make sure you take it to a body shop who will seal the trimmed back metal otherwise it'll rust and spread like cancer.
Even better, have some extended wheel arch liners made up to protect it from crap.