Depends entirely on the offset of the wheels you want to fit.
Lower offset means thinner spacer.
I run Enkei 9.5 x 18 ET35 with half inch (12.7mm) spacer on the front for effective ET22 and inch spacer on the rear for effective ET10.
See photo's for poke .... they are a bit cr4p but should give you an idea at least,.
You say you have OEM 18" wheels but do not say whether they are base or sport ....... let us know which and we might be able to help
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