I would let them know you thought you were getting 18" and to see what they can do. Your leverage is pretty weak now, but sometimes if its an incremental cost they may be able to do something to keep you happy.
Problem is a lot of times the rims are tied to the car based on trim level, so getting the 18" might be a bit more tricky than just a quick flip (assuming you've got a deal on a specific unit).
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