I'd say that rim fitment will be perfect, though the tyre size is going to be too small and your speedo will be a long way out. Just be careful as the legal size is on the tyre placard inside your fuel filler flap. For an 18" rim it's 235/50 R18.
You can go one tyre size either way but going 2 sizes is not legal in most states. It can also cause problems for your insurance so I'd recommend factoring in changing the tyres if you buy the wheels. It's not worth the risk.
Otherwise run your stock wheels a little longer (as long as you have enough legal tread) until you can afford new rubber and then put the new rims/tyres on your car.
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