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you better taking them back and getting bigger 6.5 " speakers. You can then use Corsa speaker adapters or look on ebay for speaker adaptors. Here are some here:
i assume you are talking 4 inch for the rears , if you are doing the fronts then as posted above get a decent pair or the right size which should be 6.5
when i got my 6.5 inch front ones i did not need an adaptor they went in as a straight replacement so try that first
Mine didn't on my hawk eye , I needed an adaptor. However , even 6.5 didn't give me the sound I was after. Can't imagine 4" would be any good front or back.