You can, but why spend more money on wheel spacers instead of getting the correct wheel. It's a matter of choice but I prefer to have the correct wheels. I've seen some people doing what you just said but for some reason I don't dig the idea too much.
If you really want to keep the wheels then go ahead witht he spacers. Nothing wrong with that. Only thing is that wheels spacer are going to cost the same as 2 new wheels. The front wheels will work fine that you have, but if I were you Id sell the back wheels and use that money to buy the proper wheels.
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